Merge 7fe49734d7 into d6bcd3fb0b

In line with the ShadowRealm proposal changes in the WebIDL spec:
webidl#1437 and supporting changes in HTML spec.

This is required for ShadowRealms as they have no relevant settings
object on the shadow realm, so fixes a crash in the QueueingStrategy
test in this commit.

Libraries/LibWeb/Bindings/MainThreadVM.cpp

@@ -673,7 +673,7 @@ void queue_mutation_observer_microtask(DOM::Document const& document)
             // 4. If records is not empty, then invoke mo’s callback with « records, mo », and mo. If this throws an exception, catch it, and report the exception.
             if (!records.is_empty()) {
                 auto& callback = mutation_observer->callback();
-                auto& realm = callback.callback_context->realm();
+                auto& realm = callback.callback_context;
 
                 auto wrapped_records = MUST(JS::Array::create(realm, 0));
                 for (size_t i = 0; i < records.size(); ++i) {

Libraries/LibWeb/CSS/CharacterTypes.h

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2024, the Ladybird developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/CharacterTypes.h>
+#include <AK/Types.h>
+
+namespace Web::CSS {
+
+// https://www.w3.org/TR/css-syntax-3/#digit
+constexpr bool is_digit(u32 code_point)
+{
+    // A code point between U+0030 DIGIT ZERO (0) and U+0039 DIGIT NINE (9) inclusive.
+    return code_point >= 0x30 && code_point <= 0x39;
+}
+
+// https://www.w3.org/TR/css-syntax-3/#hex-digit
+constexpr bool is_hex_digit(u32 code_point)
+{
+    // A digit,
+    // or a code point between U+0041 LATIN CAPITAL LETTER A (A) and U+0046 LATIN CAPITAL LETTER F (F) inclusive,
+    // or a code point between U+0061 LATIN SMALL LETTER A (a) and U+0066 LATIN SMALL LETTER F (f) inclusive.
+    return is_digit(code_point) || (code_point >= 0x41 && code_point <= 0x46) || (code_point >= 0x61 && code_point <= 0x66);
+}
+
+// https://www.w3.org/TR/css-syntax-3/#ident-start-code-point
+constexpr bool is_ident_start_code_point(u32 code_point)
+{
+    // A letter, a non-ASCII code point, or U+005F LOW LINE (_).
+    // Note: the is_unicode condition is used to reject the Tokenizer's EOF codepoint.
+    return is_ascii_alpha(code_point) || (!is_ascii(code_point) && is_unicode(code_point)) || code_point == '_';
+}
+
+// https://www.w3.org/TR/css-syntax-3/#ident-code-point
+constexpr bool is_ident_code_point(u32 code_point)
+{
+    // An ident-start code point, a digit, or U+002D HYPHEN-MINUS (-).
+    return is_ident_start_code_point(code_point) || is_ascii_digit(code_point) || code_point == '-';
+}
+
+// https://www.w3.org/TR/css-syntax-3/#non-printable-code-point
+constexpr bool is_non_printable_code_point(u32 code_point)
+{
+    return code_point <= 0x8 || code_point == 0xB || (code_point >= 0xE && code_point <= 0x1F) || code_point == 0x7F;
+}
+
+// https://www.w3.org/TR/css-syntax-3/#newline
+constexpr inline bool is_newline(u32 code_point)
+{
+    // U+000A LINE FEED.
+    // Note that U+000D CARRIAGE RETURN and U+000C FORM FEED are not included in this definition,
+    // as they are converted to U+000A LINE FEED during preprocessing.
+    return code_point == 0xA;
+}
+
+// https://www.w3.org/TR/css-syntax-3/#whitespace
+constexpr bool is_whitespace(u32 code_point)
+{
+    // A newline, U+0009 CHARACTER TABULATION, or U+0020 SPACE.
+    return is_newline(code_point) || code_point == '\t' || code_point == ' ';
+}
+
+// https://www.w3.org/TR/css-syntax-3/#maximum-allowed-code-point
+constexpr bool is_greater_than_maximum_allowed_code_point(u32 code_point)
+{
+    // The greatest code point defined by Unicode: U+10FFFF.
+    return code_point > 0x10FFFF;
+}
+}

Libraries/LibWeb/CSS/Parser/Parser.cpp

@@ -22,6 +22,7 @@
 #include <LibWeb/CSS/CSSStyleSheet.h>
 #include <LibWeb/CSS/CSSStyleValue.h>
 #include <LibWeb/CSS/CalculatedOr.h>
+#include <LibWeb/CSS/CharacterTypes.h>
 #include <LibWeb/CSS/EdgeRect.h>
 #include <LibWeb/CSS/MediaList.h>
 #include <LibWeb/CSS/Parser/Parser.h>
@@ -7585,20 +7586,60 @@ RefPtr<CSSStyleValue> Parser::parse_grid_shorthand_value(TokenStream<ComponentVa
 RefPtr<CSSStyleValue> Parser::parse_grid_template_areas_value(TokenStream<ComponentValue>& tokens)
 {
     // none | <string>+
-    Vector<Vector<String>> grid_area_rows;
-
     if (auto none = parse_all_as_single_keyword_value(tokens, Keyword::None))
-        return GridTemplateAreaStyleValue::create(move(grid_area_rows));
+        return GridTemplateAreaStyleValue::create({});
+
+    auto is_full_stop = [](u32 code_point) {
+        return code_point == '.';
+    };
+
+    auto consume_while = [](Utf8CodePointIterator& code_points, AK::Function<bool(u32)> predicate) {
+        StringBuilder builder;
+        while (!code_points.done() && predicate(*code_points)) {
+            builder.append_code_point(*code_points);
+            ++code_points;
+        }
+        return MUST(builder.to_string());
+    };
+
+    Vector<Vector<String>> grid_area_rows;
+    Optional<size_t> column_count;
 
     auto transaction = tokens.begin_transaction();
     while (tokens.has_next_token() && tokens.next_token().is(Token::Type::String)) {
         Vector<String> grid_area_columns;
-        auto const parts = MUST(tokens.consume_a_token().token().string().to_string().split(' '));
+        auto string = tokens.consume_a_token().token().string().code_points();
-        for (auto& part : parts) {
+        auto code_points = string.begin();
-            grid_area_columns.append(part);
+
+        while (!code_points.done()) {
+            if (is_whitespace(*code_points)) {
+                consume_while(code_points, is_whitespace);
+            } else if (is_full_stop(*code_points)) {
+                consume_while(code_points, *is_full_stop);
+                grid_area_columns.append("."_string);
+            } else if (is_ident_code_point(*code_points)) {
+                auto token = consume_while(code_points, is_ident_code_point);
+                grid_area_columns.append(move(token));
+            } else {
+                return nullptr;
+            }
         }
+
+        if (grid_area_columns.is_empty())
+            return nullptr;
+
+        if (column_count.has_value()) {
+            if (grid_area_columns.size() != column_count)
+                return nullptr;
+        } else {
+            column_count = grid_area_columns.size();
+        }
+
         grid_area_rows.append(move(grid_area_columns));
     }
+
+    // FIXME: If a named grid area spans multiple grid cells, but those cells do not form a single filled-in rectangle, the declaration is invalid.
+
     transaction.commit();
     return GridTemplateAreaStyleValue::create(grid_area_rows);
 }

Libraries/LibWeb/CSS/Parser/Tokenizer.cpp

@@ -5,12 +5,12 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <AK/CharacterTypes.h>
 #include <AK/Debug.h>
 #include <AK/FloatingPointStringConversions.h>
 #include <AK/SourceLocation.h>
 #include <AK/Vector.h>
 #include <LibTextCodec/Decoder.h>
+#include <LibWeb/CSS/CharacterTypes.h>
 #include <LibWeb/CSS/Parser/Tokenizer.h>
 #include <LibWeb/Infra/Strings.h>
 
@@ -35,41 +35,11 @@ static inline bool is_quotation_mark(u32 code_point)
     return code_point == 0x22;
 }
 
-static inline bool is_greater_than_maximum_allowed_code_point(u32 code_point)
-{
-    return code_point > 0x10FFFF;
-}
-
-static inline bool is_low_line(u32 code_point)
-{
-    return code_point == 0x5F;
-}
-
-// https://www.w3.org/TR/css-syntax-3/#ident-start-code-point
-static inline bool is_ident_start_code_point(u32 code_point)
-{
-    // FIXME: We use !is_ascii() for "non-ASCII code point" in the spec, but it's not quite right -
-    //        it treats EOF as a valid! The spec also lacks a definition of code point. For now, the
-    //        !is_eof() check is a hack, but it should work.
-    return !is_eof(code_point) && (is_ascii_alpha(code_point) || !is_ascii(code_point) || is_low_line(code_point));
-}
-
 static inline bool is_hyphen_minus(u32 code_point)
 {
     return code_point == 0x2D;
 }
 
-// https://www.w3.org/TR/css-syntax-3/#ident-code-point
-static inline bool is_ident_code_point(u32 code_point)
-{
-    return is_ident_start_code_point(code_point) || is_ascii_digit(code_point) || is_hyphen_minus(code_point);
-}
-
-static inline bool is_non_printable(u32 code_point)
-{
-    return code_point <= 0x8 || code_point == 0xB || (code_point >= 0xE && code_point <= 0x1F) || code_point == 0x7F;
-}
-
 static inline bool is_number_sign(u32 code_point)
 {
     return code_point == 0x23;
@@ -110,11 +80,6 @@ static inline bool is_full_stop(u32 code_point)
     return code_point == 0x2E;
 }
 
-static inline bool is_newline(u32 code_point)
-{
-    return code_point == 0xA;
-}
-
 static inline bool is_asterisk(u32 code_point)
 {
     return code_point == 0x2A;
@@ -170,11 +135,6 @@ static inline bool is_closed_curly_bracket(u32 code_point)
     return code_point == 0x7D;
 }
 
-static inline bool is_whitespace(u32 code_point)
-{
-    return code_point == 0x9 || code_point == 0xA || code_point == 0x20;
-}
-
 static inline bool is_percent(u32 code_point)
 {
     return code_point == 0x25;
@@ -400,14 +360,14 @@ u32 Tokenizer::consume_escaped_code_point()
     auto input = next_code_point();
 
     // hex digit
-    if (is_ascii_hex_digit(input)) {
+    if (is_hex_digit(input)) {
         // Consume as many hex digits as possible, but no more than 5.
         // Note that this means 1-6 hex digits have been consumed in total.
         StringBuilder builder;
         builder.append_code_point(input);
 
         size_t counter = 0;
-        while (is_ascii_hex_digit(peek_code_point()) && counter++ < 5) {
+        while (is_hex_digit(peek_code_point()) && counter++ < 5) {
             builder.append_code_point(next_code_point());
         }
 
@@ -517,7 +477,7 @@ Number Tokenizer::consume_a_number()
     // 3. While the next input code point is a digit, consume it and append it to repr.
     for (;;) {
         auto digits = peek_code_point();
-        if (!is_ascii_digit(digits))
+        if (!is_digit(digits))
             break;
 
         repr.append_code_point(next_code_point());
@@ -525,7 +485,7 @@ Number Tokenizer::consume_a_number()
 
     // 4. If the next 2 input code points are U+002E FULL STOP (.) followed by a digit, then:
     auto maybe_number = peek_twin();
-    if (is_full_stop(maybe_number.first) && is_ascii_digit(maybe_number.second)) {
+    if (is_full_stop(maybe_number.first) && is_digit(maybe_number.second)) {
         // 1. Consume them.
         // 2. Append them to repr.
         repr.append_code_point(next_code_point());
@@ -537,7 +497,7 @@ Number Tokenizer::consume_a_number()
         // 4. While the next input code point is a digit, consume it and append it to repr.
         for (;;) {
             auto digit = peek_code_point();
-            if (!is_ascii_digit(digit))
+            if (!is_digit(digit))
                 break;
 
             repr.append_code_point(next_code_point());
@@ -549,17 +509,17 @@ Number Tokenizer::consume_a_number()
     // or U+002B PLUS SIGN (+), followed by a digit, then:
     auto maybe_exp = peek_triplet();
     if ((is_E(maybe_exp.first) || is_e(maybe_exp.first))
-        && (((is_plus_sign(maybe_exp.second) || is_hyphen_minus(maybe_exp.second)) && is_ascii_digit(maybe_exp.third))
+        && (((is_plus_sign(maybe_exp.second) || is_hyphen_minus(maybe_exp.second)) && is_digit(maybe_exp.third))
-            || (is_ascii_digit(maybe_exp.second)))) {
+            || (is_digit(maybe_exp.second)))) {
         // 1. Consume them.
         // 2. Append them to repr.
         if (is_plus_sign(maybe_exp.second) || is_hyphen_minus(maybe_exp.second)) {
-            if (is_ascii_digit(maybe_exp.third)) {
+            if (is_digit(maybe_exp.third)) {
                 repr.append_code_point(next_code_point());
                 repr.append_code_point(next_code_point());
                 repr.append_code_point(next_code_point());
             }
-        } else if (is_ascii_digit(maybe_exp.second)) {
+        } else if (is_digit(maybe_exp.second)) {
             repr.append_code_point(next_code_point());
             repr.append_code_point(next_code_point());
         }
@@ -570,7 +530,7 @@ Number Tokenizer::consume_a_number()
         // 4. While the next input code point is a digit, consume it and append it to repr.
         for (;;) {
             auto digits = peek_code_point();
-            if (!is_ascii_digit(digits))
+            if (!is_digit(digits))
                 break;
 
             repr.append_code_point(next_code_point());
@@ -713,7 +673,7 @@ Token Tokenizer::consume_a_url_token()
         // U+0027 APOSTROPHE (')
         // U+0028 LEFT PARENTHESIS (()
         // non-printable code point
-        if (is_quotation_mark(input) || is_apostrophe(input) || is_left_paren(input) || is_non_printable(input)) {
+        if (is_quotation_mark(input) || is_apostrophe(input) || is_left_paren(input) || is_non_printable_code_point(input)) {
             // This is a parse error. Consume the remnants of a bad url, create a <bad-url-token>, and return it.
             log_parse_error();
             consume_the_remnants_of_a_bad_url();
@@ -855,12 +815,12 @@ bool Tokenizer::would_start_a_number(U32Triplet values)
     // U+002D HYPHEN-MINUS (-)
     if (is_plus_sign(values.first) || is_hyphen_minus(values.first)) {
         // If the second code point is a digit, return true.
-        if (is_ascii_digit(values.second))
+        if (is_digit(values.second))
             return true;
 
         // Otherwise, if the second code point is a U+002E FULL STOP (.) and the third
         // code point is a digit, return true.
-        if (is_full_stop(values.second) && is_ascii_digit(values.third))
+        if (is_full_stop(values.second) && is_digit(values.third))
             return true;
 
         // Otherwise, return false.
@@ -870,10 +830,10 @@ bool Tokenizer::would_start_a_number(U32Triplet values)
     // U+002E FULL STOP (.)
     if (is_full_stop(values.first))
         // If the second code point is a digit, return true. Otherwise, return false.
-        return is_ascii_digit(values.second);
+        return is_digit(values.second);
 
     // digit
-    if (is_ascii_digit(values.first))
+    if (is_digit(values.first))
         // Return true.
         return true;
 
@@ -1328,7 +1288,7 @@ Token Tokenizer::consume_a_token()
     }
 
     // digit
-    if (is_ascii_digit(input)) {
+    if (is_digit(input)) {
         dbgln_if(CSS_TOKENIZER_DEBUG, "is digit");
         // Reconsume the current input code point, consume a numeric token, and return it.
         reconsume_current_input_code_point();

Libraries/LibWeb/CSS/StyleValues/GridTemplateAreaStyleValue.cpp

@@ -8,6 +8,7 @@
  */
 
 #include "GridTemplateAreaStyleValue.h"
+#include <LibWeb/CSS/Serialize.h>
 
 namespace Web::CSS {
 
@@ -23,13 +24,15 @@ String GridTemplateAreaStyleValue::to_string() const
 
     StringBuilder builder;
     for (size_t y = 0; y < m_grid_template_area.size(); ++y) {
+        if (y != 0)
+            builder.append(' ');
+        StringBuilder row_builder;
         for (size_t x = 0; x < m_grid_template_area[y].size(); ++x) {
-            builder.appendff("{}", m_grid_template_area[y][x]);
+            if (x != 0)
-            if (x < m_grid_template_area[y].size() - 1)
+                row_builder.append(' ');
-                builder.append(" "sv);
+            row_builder.appendff("{}", m_grid_template_area[y][x]);
         }
-        if (y < m_grid_template_area.size() - 1)
+        serialize_a_string(builder, row_builder.string_view());
-            builder.append(", "sv);
     }
     return MUST(builder.to_string());
 }

Libraries/LibWeb/DOM/Document.cpp

@@ -4203,7 +4203,7 @@ void Document::start_intersection_observing_a_lazy_loading_element(Element& elem
         // Spec Note: This allows for fetching the image during scrolling, when it does not yet — but is about to — intersect the viewport.
         auto options = IntersectionObserver::IntersectionObserverInit {};
 
-        auto wrapped_callback = realm.heap().allocate<WebIDL::CallbackType>(callback, Bindings::principal_host_defined_environment_settings_object(realm));
+        auto wrapped_callback = realm.heap().allocate<WebIDL::CallbackType>(callback, realm);
         m_lazy_load_intersection_observer = IntersectionObserver::IntersectionObserver::construct_impl(realm, wrapped_callback, options).release_value_but_fixme_should_propagate_errors();
     }
 

Libraries/LibWeb/DOM/EventTarget.cpp

@@ -492,7 +492,8 @@ WebIDL::CallbackType* EventTarget::get_current_value_of_event_handler(FlyString
         function->set_script_or_module({});
 
         // 12. Set eventHandler's value to the result of creating a Web IDL EventHandler callback function object whose object reference is function and whose callback context is settings object.
-        event_handler->value = GC::Ptr(realm.heap().allocate<WebIDL::CallbackType>(*function, settings_object));
+        // FIXME: Update this comment once the ShadowRealm proposal is merged to pass realm.
+        event_handler->value = GC::Ptr(realm.heap().allocate<WebIDL::CallbackType>(*function, realm));
     }
 
     // 4. Return eventHandler's value.
@@ -584,7 +585,7 @@ void EventTarget::activate_event_handler(FlyString const& name, HTML::EventHandl
         0, "", &realm);
 
     // NOTE: As per the spec, the callback context is arbitrary.
-    auto callback = realm.heap().allocate<WebIDL::CallbackType>(*callback_function, Bindings::principal_host_defined_environment_settings_object(realm));
+    auto callback = realm.heap().allocate<WebIDL::CallbackType>(*callback_function, realm);
 
     // 5. Let listener be a new event listener whose type is the event handler event type corresponding to eventHandler and callback is callback.
     auto listener = realm.heap().allocate<DOMEventListener>();

Libraries/LibWeb/Fetch/Fetching/Fetching.cpp

@@ -860,33 +860,79 @@ WebIDL::ExceptionOr<GC::Ref<PendingResponse>> scheme_fetch(JS::Realm& realm, Inf
             auto content_type_header = Infrastructure::Header::from_string_pair("Content-Type"sv, type);
             response->header_list()->append(move(content_type_header));
         }
-        // FIXME: 9. Otherwise:
+        // 9. Otherwise:
         else {
             // 1. Set response’s range-requested flag.
+            response->set_range_requested(true);
+
             // 2. Let rangeHeader be the result of getting `Range` from request’s header list.
+            auto const range_header = request->header_list()->get("Range"sv.bytes()).value_or(ByteBuffer {});
+
             // 3. Let rangeValue be the result of parsing a single range header value given rangeHeader and true.
+            auto maybe_range_value = Infrastructure::parse_single_range_header_value(range_header, true);
+
             // 4. If rangeValue is failure, then return a network error.
+            if (!maybe_range_value.has_value())
+                return PendingResponse::create(vm, request, Infrastructure::Response::network_error(vm, "Failed to parse single range header value"sv));
+
             // 5. Let (rangeStart, rangeEnd) be rangeValue.
+            auto& [range_start, range_end] = maybe_range_value.value();
+
             // 6. If rangeStart is null:
-            //     1. Set rangeStart to fullLength − rangeEnd.
+            if (!range_start.has_value()) {
-            //     2. Set rangeEnd to rangeStart + rangeEnd − 1.
+                VERIFY(range_end.has_value());
+
+                // 1. Set rangeStart to fullLength − rangeEnd.
+                range_start = full_length - *range_end;
+
+                // 2. Set rangeEnd to rangeStart + rangeEnd − 1.
+                range_end = *range_start + *range_end - 1;
+            }
             // 7. Otherwise:
-            //     1. If rangeStart is greater than or equal to fullLength, then return a network error.
+            else {
-            //     2. If rangeEnd is null or rangeEnd is greater than or equal to fullLength, then set rangeEnd to fullLength − 1.
+                // 1. If rangeStart is greater than or equal to fullLength, then return a network error.
+                if (*range_start >= full_length)
+                    return PendingResponse::create(vm, request, Infrastructure::Response::network_error(vm, "rangeStart is greater than or equal to fullLength"sv));
+
+                // 2. If rangeEnd is null or rangeEnd is greater than or equal to fullLength, then set rangeEnd to fullLength − 1.
+                if (!range_end.has_value() || *range_end >= full_length)
+                    range_end = full_length - 1;
+            }
+
             // 8. Let slicedBlob be the result of invoking slice blob given blob, rangeStart, rangeEnd + 1, and type.
+            auto sliced_blob = TRY(blob->slice(*range_start, *range_end + 1, type));
+
             // 9. Let slicedBodyWithType be the result of safely extracting slicedBlob.
+            auto sliced_body_with_type = TRY(safely_extract_body(realm, sliced_blob->raw_bytes()));
+
             // 10. Set response’s body to slicedBodyWithType’s body.
+            response->set_body(sliced_body_with_type.body);
+
             // 11. Let serializedSlicedLength be slicedBlob’s size, serialized and isomorphic encoded.
-            // 12. Let contentRange be `bytes `.
+            auto serialized_sliced_length = String::number(sliced_blob->size());
-            // 13. Append rangeStart, serialized and isomorphic encoded, to contentRange.
+
-            // 14. Append 0x2D (-) to contentRange.
+            // 12. Let contentRange be the result of invoking build a content range given rangeStart, rangeEnd, and fullLength.
-            // 15. Append rangeEnd, serialized and isomorphic encoded to contentRange.
+            auto content_range = Infrastructure::build_content_range(*range_start, *range_end, full_length);
-            // 16. Append 0x2F (/) to contentRange.
+
-            // 17. Append serializedFullLength to contentRange.
+            // 13. Set response’s status to 206.
-            // 18. Set response’s status to 206.
+            response->set_status(206);
-            // 19. Set response’s status message to `Partial Content`.
+
-            // 20. Set response’s header list to « (`Content-Length`, serializedSlicedLength), (`Content-Type`, type), (`Content-Range`, contentRange) ».
+            // 14. Set response’s status message to `Partial Content`.
-            return PendingResponse::create(vm, request, Infrastructure::Response::network_error(vm, "Request has a 'blob:' URL with a Content-Range header, which is currently unsupported"sv));
+            response->set_status_message(MUST(ByteBuffer::copy("Partial Content"sv.bytes())));
+
+            // 15. Set response’s header list to «
+
+            // (`Content-Length`, serializedSlicedLength),
+            auto content_length_header = Infrastructure::Header::from_string_pair("Content-Length"sv, serialized_sliced_length);
+            response->header_list()->append(move(content_length_header));
+
+            // (`Content-Type`, type),
+            auto content_type_header = Infrastructure::Header::from_string_pair("Content-Type"sv, type);
+            response->header_list()->append(move(content_type_header));
+
+            // (`Content-Range`, contentRange) ».
+            auto content_range_header = Infrastructure::Header::from_string_pair("Content-Range"sv, content_range);
+            response->header_list()->append(move(content_range_header));
         }
 
         // 10. Return response.

Libraries/LibWeb/Fetch/Infrastructure/HTTP.h

@@ -32,6 +32,11 @@ inline constexpr Array HTTP_TAB_OR_SPACE_BYTES = {
     0x09, 0x20
 };
 
+constexpr bool is_http_tab_or_space(u32 const code_point)
+{
+    return code_point == 0x09 || code_point == 0x20;
+}
+
 enum class HttpQuotedStringExtractValue {
     No,
     Yes,

Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.cpp

@@ -544,8 +544,8 @@ bool is_cors_safelisted_request_header(Header const& header)
     }
     // `range`
     else if (name.equals_ignoring_ascii_case("range"sv)) {
-        // 1. Let rangeValue be the result of parsing a single range header value given value.
+        // 1. Let rangeValue be the result of parsing a single range header value given value and false.
-        auto range_value = parse_single_range_header_value(value);
+        auto range_value = parse_single_range_header_value(value, false);
 
         // 2. If rangeValue is failure, then return false.
         if (!range_value.has_value())
@@ -832,51 +832,84 @@ Variant<Vector<ByteBuffer>, ExtractHeaderParseFailure, Empty> extract_header_lis
     return values;
 }
 
+// https://fetch.spec.whatwg.org/#build-a-content-range
+ByteString build_content_range(u64 const& range_start, u64 const& range_end, u64 const& full_length)
+{
+    // 1. Let contentRange be `bytes `.
+    // 2. Append rangeStart, serialized and isomorphic encoded, to contentRange.
+    // 3. Append 0x2D (-) to contentRange.
+    // 4. Append rangeEnd, serialized and isomorphic encoded to contentRange.
+    // 5. Append 0x2F (/) to contentRange.
+    // 6. Append fullLength, serialized and isomorphic encoded to contentRange.
+    // 7. Return contentRange.
+    return ByteString::formatted("bytes {}-{}/{}", String::number(range_start), String::number(range_end), String::number(full_length));
+}
+
 // https://fetch.spec.whatwg.org/#simple-range-header-value
-Optional<RangeHeaderValue> parse_single_range_header_value(ReadonlyBytes value)
+Optional<RangeHeaderValue> parse_single_range_header_value(ReadonlyBytes const value, bool const allow_whitespace)
 {
     // 1. Let data be the isomorphic decoding of value.
-    auto data = Infra::isomorphic_decode(value);
+    auto const data = Infra::isomorphic_decode(value);
 
-    // 2. If data does not start with "bytes=", then return failure.
+    // 2. If data does not start with "bytes", then return failure.
-    if (!data.starts_with_bytes("bytes="sv))
+    if (!data.starts_with_bytes("bytes"sv))
         return {};
 
-    // 3. Let position be a position variable for data, initially pointing at the 6th code point of data.
+    // 3. Let position be a position variable for data, initially pointing at the 5th code point of data.
     auto lexer = GenericLexer { data };
-    lexer.ignore(6);
+    lexer.ignore(5);
 
-    // 4. Let rangeStart be the result of collecting a sequence of code points that are ASCII digits, from data given position.
+    // 4. If allowWhitespace is true, collect a sequence of code points that are HTTP tab or space, from data given position.
+    if (allow_whitespace)
+        lexer.consume_while(is_http_tab_or_space);
+
+    // 5. If the code point at position within data is not U+003D (=), then return failure.
+    // 6. Advance position by 1.
+    if (!lexer.consume_specific('='))
+        return {};
+
+    // 7. If allowWhitespace is true, collect a sequence of code points that are HTTP tab or space, from data given position.
+    if (allow_whitespace)
+        lexer.consume_while(is_http_tab_or_space);
+
+    // 8. Let rangeStart be the result of collecting a sequence of code points that are ASCII digits, from data given position.
     auto range_start = lexer.consume_while(is_ascii_digit);
 
-    // 5. Let rangeStartValue be rangeStart, interpreted as decimal number, if rangeStart is not the empty string; otherwise null.
+    // 9. Let rangeStartValue be rangeStart, interpreted as decimal number, if rangeStart is not the empty string; otherwise null.
     auto range_start_value = range_start.to_number<u64>();
 
-    // 6. If the code point at position within data is not U+002D (-), then return failure.
+    // 10. If allowWhitespace is true, collect a sequence of code points that are HTTP tab or space, from data given position.
-    // 7. Advance position by 1.
+    if (allow_whitespace)
+        lexer.consume_while(is_http_tab_or_space);
+
+    // 11. If the code point at position within data is not U+002D (-), then return failure.
+    // 12. Advance position by 1.
     if (!lexer.consume_specific('-'))
         return {};
 
-    // 8. Let rangeEnd be the result of collecting a sequence of code points that are ASCII digits, from data given position.
+    // 13. If allowWhitespace is true, collect a sequence of code points that are HTTP tab or space, from data given position.
+    if (allow_whitespace)
+        lexer.consume_while(is_http_tab_or_space);
+
+    // 14. Let rangeEnd be the result of collecting a sequence of code points that are ASCII digits, from data given position.
     auto range_end = lexer.consume_while(is_ascii_digit);
 
-    // 9. Let rangeEndValue be rangeEnd, interpreted as decimal number, if rangeEnd is not the empty string; otherwise null.
+    // 15. Let rangeEndValue be rangeEnd, interpreted as decimal number, if rangeEnd is not the empty string; otherwise null.
     auto range_end_value = range_end.to_number<u64>();
 
-    // 10. If position is not past the end of data, then return failure.
+    // 16. If position is not past the end of data, then return failure.
     if (!lexer.is_eof())
         return {};
 
-    // 11. If rangeEndValue and rangeStartValue are null, then return failure.
+    // 17. If rangeEndValue and rangeStartValue are null, then return failure.
     if (!range_end_value.has_value() && !range_start_value.has_value())
         return {};
 
-    // 12. If rangeStartValue and rangeEndValue are numbers, and rangeStartValue is greater than rangeEndValue, then return failure.
+    // 18. If rangeStartValue and rangeEndValue are numbers, and rangeStartValue is greater than rangeEndValue, then return failure.
     if (range_start_value.has_value() && range_end_value.has_value() && *range_start_value > *range_end_value)
         return {};
 
-    // 13. Return (rangeStartValue, rangeEndValue).
+    // 19. Return (rangeStartValue, rangeEndValue).
-    // NOTE: The range end or start can be omitted, e.g., `bytes=0-` or `bytes=-500` are valid ranges.
     return RangeHeaderValue { move(range_start_value), move(range_end_value) };
 }
 

Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.h

@@ -93,7 +93,8 @@ struct ExtractHeaderParseFailure {
 [[nodiscard]] bool is_request_body_header_name(ReadonlyBytes);
 [[nodiscard]] Optional<Vector<ByteBuffer>> extract_header_values(Header const&);
 [[nodiscard]] Variant<Vector<ByteBuffer>, ExtractHeaderParseFailure, Empty> extract_header_list_values(ReadonlyBytes, HeaderList const&);
-[[nodiscard]] Optional<RangeHeaderValue> parse_single_range_header_value(ReadonlyBytes);
+[[nodiscard]] ByteString build_content_range(u64 const& range_start, u64 const& range_end, u64 const& full_length);
+[[nodiscard]] Optional<RangeHeaderValue> parse_single_range_header_value(ReadonlyBytes, bool);
 [[nodiscard]] ByteBuffer default_user_agent_value();
 
 }

Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.cpp

@@ -44,6 +44,7 @@ void CustomElementRegistry::visit_edges(Visitor& visitor)
 }
 
 // https://webidl.spec.whatwg.org/#es-callback-function
+// https://github.com/whatwg/html/pull/9893
 static JS::ThrowCompletionOr<GC::Ref<WebIDL::CallbackType>> convert_value_to_callback_function(JS::VM& vm, JS::Value value)
 {
     // FIXME: De-duplicate this from the IDL generator.
@@ -51,8 +52,8 @@ static JS::ThrowCompletionOr<GC::Ref<WebIDL::CallbackType>> convert_value_to_cal
     if (!value.is_function())
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAFunction, value.to_string_without_side_effects());
 
-    // 2. Return the IDL callback function type value that represents a reference to the same object that V represents, with the incumbent settings object as the callback context.
+    // 2. Return the IDL callback function type value that represents a reference to the same object that V represents, with the incumbent realm as the callback context.
-    return vm.heap().allocate<WebIDL::CallbackType>(value.as_object(), HTML::incumbent_settings_object());
+    return vm.heap().allocate<WebIDL::CallbackType>(value.as_object(), HTML::incumbent_realm());
 }
 
 // https://webidl.spec.whatwg.org/#es-sequence

Libraries/LibWeb/HTML/HTMLDialogElement.cpp

@@ -215,7 +215,7 @@ WebIDL::ExceptionOr<void> HTMLDialogElement::show_modal()
             return JS::js_undefined();
         },
         0, "", &realm());
-    auto cancel_callback = realm().heap().allocate<WebIDL::CallbackType>(*cancel_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+    auto cancel_callback = realm().heap().allocate<WebIDL::CallbackType>(*cancel_callback_function, realm());
     m_close_watcher->add_event_listener_without_options(HTML::EventNames::cancel, DOM::IDLEventListener::create(realm(), cancel_callback));
     // - closeAction being to close the dialog given this and null.
     auto close_callback_function = JS::NativeFunction::create(
@@ -225,7 +225,7 @@ WebIDL::ExceptionOr<void> HTMLDialogElement::show_modal()
             return JS::js_undefined();
         },
         0, "", &realm());
-    auto close_callback = realm().heap().allocate<WebIDL::CallbackType>(*close_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+    auto close_callback = realm().heap().allocate<WebIDL::CallbackType>(*close_callback_function, realm());
     m_close_watcher->add_event_listener_without_options(HTML::EventNames::close, DOM::IDLEventListener::create(realm(), close_callback));
 
     // FIXME: 16. Set this's previously focused element to the focused element.

Libraries/LibWeb/HTML/HTMLInputElement.cpp

@@ -899,7 +899,7 @@ void HTMLInputElement::create_text_input_shadow_tree()
                 return JS::js_undefined();
             },
             0, "", &realm());
-        auto mouseup_callback = realm().heap().allocate<WebIDL::CallbackType>(*mouseup_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+        auto mouseup_callback = realm().heap().allocate<WebIDL::CallbackType>(*mouseup_callback_function, realm());
         DOM::AddEventListenerOptions mouseup_listener_options;
         mouseup_listener_options.once = true;
 
@@ -912,7 +912,7 @@ void HTMLInputElement::create_text_input_shadow_tree()
                 return JS::js_undefined();
             },
             0, "", &realm());
-        auto step_up_callback = realm().heap().allocate<WebIDL::CallbackType>(*up_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+        auto step_up_callback = realm().heap().allocate<WebIDL::CallbackType>(*up_callback_function, realm());
         up_button->add_event_listener_without_options(UIEvents::EventNames::mousedown, DOM::IDLEventListener::create(realm(), step_up_callback));
         up_button->add_event_listener_without_options(UIEvents::EventNames::mouseup, DOM::IDLEventListener::create(realm(), mouseup_callback));
 
@@ -934,7 +934,7 @@ void HTMLInputElement::create_text_input_shadow_tree()
                 return JS::js_undefined();
             },
             0, "", &realm());
-        auto step_down_callback = realm().heap().allocate<WebIDL::CallbackType>(*down_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+        auto step_down_callback = realm().heap().allocate<WebIDL::CallbackType>(*down_callback_function, realm());
         down_button->add_event_listener_without_options(UIEvents::EventNames::mousedown, DOM::IDLEventListener::create(realm(), step_down_callback));
         down_button->add_event_listener_without_options(UIEvents::EventNames::mouseup, DOM::IDLEventListener::create(realm(), mouseup_callback));
     }
@@ -993,7 +993,7 @@ void HTMLInputElement::create_file_input_shadow_tree()
     };
 
     auto on_button_click_function = JS::NativeFunction::create(realm, move(on_button_click), 0, "", &realm);
-    auto on_button_click_callback = realm.heap().allocate<WebIDL::CallbackType>(on_button_click_function, Bindings::principal_host_defined_environment_settings_object(realm));
+    auto on_button_click_callback = realm.heap().allocate<WebIDL::CallbackType>(on_button_click_function, realm);
     m_file_button->add_event_listener_without_options(UIEvents::EventNames::click, DOM::IDLEventListener::create(realm, on_button_click_callback));
 
     update_file_input_shadow_tree();
@@ -1065,7 +1065,7 @@ void HTMLInputElement::create_range_input_shadow_tree()
             return JS::js_undefined();
         },
         0, "", &realm());
-    auto keydown_callback = realm().heap().allocate<WebIDL::CallbackType>(*keydown_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+    auto keydown_callback = realm().heap().allocate<WebIDL::CallbackType>(*keydown_callback_function, realm());
     add_event_listener_without_options(UIEvents::EventNames::keydown, DOM::IDLEventListener::create(realm(), keydown_callback));
 
     auto wheel_callback_function = JS::NativeFunction::create(
@@ -1080,7 +1080,7 @@ void HTMLInputElement::create_range_input_shadow_tree()
             return JS::js_undefined();
         },
         0, "", &realm());
-    auto wheel_callback = realm().heap().allocate<WebIDL::CallbackType>(*wheel_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+    auto wheel_callback = realm().heap().allocate<WebIDL::CallbackType>(*wheel_callback_function, realm());
     add_event_listener_without_options(UIEvents::EventNames::wheel, DOM::IDLEventListener::create(realm(), wheel_callback));
 
     auto update_slider_by_mouse = [this](JS::VM& vm) {
@@ -1103,7 +1103,7 @@ void HTMLInputElement::create_range_input_shadow_tree()
                     return JS::js_undefined();
                 },
                 0, "", &realm());
-            auto mousemove_callback = realm().heap().allocate<WebIDL::CallbackType>(*mousemove_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+            auto mousemove_callback = realm().heap().allocate<WebIDL::CallbackType>(*mousemove_callback_function, realm());
             auto mousemove_listener = DOM::IDLEventListener::create(realm(), mousemove_callback);
             auto& window = static_cast<HTML::Window&>(relevant_global_object(*this));
             window.add_event_listener_without_options(UIEvents::EventNames::mousemove, mousemove_listener);
@@ -1115,7 +1115,7 @@ void HTMLInputElement::create_range_input_shadow_tree()
                     return JS::js_undefined();
                 },
                 0, "", &realm());
-            auto mouseup_callback = realm().heap().allocate<WebIDL::CallbackType>(*mouseup_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+            auto mouseup_callback = realm().heap().allocate<WebIDL::CallbackType>(*mouseup_callback_function, realm());
             DOM::AddEventListenerOptions mouseup_listener_options;
             mouseup_listener_options.once = true;
             window.add_event_listener(UIEvents::EventNames::mouseup, DOM::IDLEventListener::create(realm(), mouseup_callback), mouseup_listener_options);
@@ -1123,7 +1123,7 @@ void HTMLInputElement::create_range_input_shadow_tree()
             return JS::js_undefined();
         },
         0, "", &realm());
-    auto mousedown_callback = realm().heap().allocate<WebIDL::CallbackType>(*mousedown_callback_function, Bindings::principal_host_defined_environment_settings_object(realm()));
+    auto mousedown_callback = realm().heap().allocate<WebIDL::CallbackType>(*mousedown_callback_function, realm());
     add_event_listener_without_options(UIEvents::EventNames::mousedown, DOM::IDLEventListener::create(realm(), mousedown_callback));
 }
 

Libraries/LibWeb/HTML/ShadowRealmGlobalScope.cpp

@@ -41,6 +41,7 @@ void ShadowRealmGlobalScope::initialize_web_interfaces()
 void ShadowRealmGlobalScope::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
+    UniversalGlobalScopeMixin::visit_edges(visitor);
 }
 
 }

Libraries/LibWeb/HTML/UniversalGlobalScope.cpp

@@ -12,6 +12,7 @@
 #include <AK/Utf8View.h>
 #include <AK/Vector.h>
 #include <LibGC/Function.h>
+#include <LibJS/Runtime/NativeFunction.h>
 #include <LibWeb/HTML/Scripting/ExceptionReporter.h>
 #include <LibWeb/HTML/StructuredSerialize.h>
 #include <LibWeb/HTML/StructuredSerializeOptions.h>
@@ -27,6 +28,12 @@ namespace Web::HTML {
 
 UniversalGlobalScopeMixin::~UniversalGlobalScopeMixin() = default;
 
+void UniversalGlobalScopeMixin::visit_edges(GC::Cell::Visitor& visitor)
+{
+    visitor.visit(m_count_queuing_strategy_size_function);
+    visitor.visit(m_byte_length_queuing_strategy_size_function);
+}
+
 // https://html.spec.whatwg.org/multipage/webappapis.html#dom-btoa
 WebIDL::ExceptionOr<String> UniversalGlobalScopeMixin::btoa(String const& data) const
 {
@@ -101,4 +108,52 @@ WebIDL::ExceptionOr<JS::Value> UniversalGlobalScopeMixin::structured_clone(JS::V
     return deserialized;
 }
 
+// https://streams.spec.whatwg.org/#count-queuing-strategy-size-function
+GC::Ref<WebIDL::CallbackType> UniversalGlobalScopeMixin::count_queuing_strategy_size_function()
+{
+    auto& realm = HTML::relevant_realm(this_impl());
+
+    if (!m_count_queuing_strategy_size_function) {
+        // 1. Let steps be the following steps:
+        auto steps = [](auto const&) {
+            // 1. Return 1.
+            return 1.0;
+        };
+
+        // 2. Let F be ! CreateBuiltinFunction(steps, 0, "size", « », globalObject’s relevant Realm).
+        auto function = JS::NativeFunction::create(realm, move(steps), 0, "size", &realm);
+
+        // 3. Set globalObject’s count queuing strategy size function to a Function that represents a reference to F, with callback context equal to globalObject’s relevant settings object.
+        // FIXME: Update spec comment to pass globalObject's relevant realm once Streams spec is updated for ShadowRealm spec
+        m_count_queuing_strategy_size_function = realm.create<WebIDL::CallbackType>(*function, realm);
+    }
+
+    return GC::Ref { *m_count_queuing_strategy_size_function };
+}
+
+// https://streams.spec.whatwg.org/#byte-length-queuing-strategy-size-function
+GC::Ref<WebIDL::CallbackType> UniversalGlobalScopeMixin::byte_length_queuing_strategy_size_function()
+{
+    auto& realm = HTML::relevant_realm(this_impl());
+
+    if (!m_byte_length_queuing_strategy_size_function) {
+        // 1. Let steps be the following steps, given chunk:
+        auto steps = [](JS::VM& vm) {
+            auto chunk = vm.argument(0);
+
+            // 1. Return ? GetV(chunk, "byteLength").
+            return chunk.get(vm, vm.names.byteLength);
+        };
+
+        // 2. Let F be ! CreateBuiltinFunction(steps, 1, "size", « », globalObject’s relevant Realm).
+        auto function = JS::NativeFunction::create(realm, move(steps), 1, "size", &realm);
+
+        // 3. Set globalObject’s byte length queuing strategy size function to a Function that represents a reference to F, with callback context equal to globalObject’s relevant settings object.
+        // FIXME: Update spec comment to pass globalObject's relevant realm once Streams spec is updated for ShadowRealm spec
+        m_byte_length_queuing_strategy_size_function = realm.create<WebIDL::CallbackType>(*function, realm);
+    }
+
+    return GC::Ref { *m_byte_length_queuing_strategy_size_function };
+}
+
 }

Libraries/LibWeb/HTML/UniversalGlobalScope.h

@@ -28,6 +28,19 @@ public:
     WebIDL::ExceptionOr<String> atob(String const& data) const;
     void queue_microtask(WebIDL::CallbackType&);
     WebIDL::ExceptionOr<JS::Value> structured_clone(JS::Value, StructuredSerializeOptions const&) const;
+
+    GC::Ref<WebIDL::CallbackType> count_queuing_strategy_size_function();
+    GC::Ref<WebIDL::CallbackType> byte_length_queuing_strategy_size_function();
+
+protected:
+    void visit_edges(GC::Cell::Visitor&);
+
+private:
+    // https://streams.spec.whatwg.org/#count-queuing-strategy-size-function
+    GC::Ptr<WebIDL::CallbackType> m_count_queuing_strategy_size_function;
+
+    // https://streams.spec.whatwg.org/#byte-length-queuing-strategy-size-function
+    GC::Ptr<WebIDL::CallbackType> m_byte_length_queuing_strategy_size_function;
 };
 
 }

Libraries/LibWeb/HTML/Window.cpp

@@ -116,6 +116,7 @@ void Window::visit_edges(JS::Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
     WindowOrWorkerGlobalScopeMixin::visit_edges(visitor);
+    UniversalGlobalScopeMixin::visit_edges(visitor);
 
     visitor.visit(m_associated_document);
     visitor.visit(m_current_event);
@@ -127,8 +128,6 @@ void Window::visit_edges(JS::Cell::Visitor& visitor)
     visitor.visit(m_animation_frame_callback_driver);
     visitor.visit(m_pdf_viewer_plugin_objects);
     visitor.visit(m_pdf_viewer_mime_type_objects);
-    visitor.visit(m_count_queuing_strategy_size_function);
-    visitor.visit(m_byte_length_queuing_strategy_size_function);
     visitor.visit(m_close_watcher_manager);
 }
 
@@ -662,52 +661,6 @@ Vector<GC::Ref<MimeType>> Window::pdf_viewer_mime_type_objects()
     return m_pdf_viewer_mime_type_objects;
 }
 
-// https://streams.spec.whatwg.org/#count-queuing-strategy-size-function
-GC::Ref<WebIDL::CallbackType> Window::count_queuing_strategy_size_function()
-{
-    auto& realm = this->realm();
-
-    if (!m_count_queuing_strategy_size_function) {
-        // 1. Let steps be the following steps:
-        auto steps = [](auto const&) {
-            // 1. Return 1.
-            return 1.0;
-        };
-
-        // 2. Let F be ! CreateBuiltinFunction(steps, 0, "size", « », globalObject’s relevant Realm).
-        auto function = JS::NativeFunction::create(realm, move(steps), 0, "size", &realm);
-
-        // 3. Set globalObject’s count queuing strategy size function to a Function that represents a reference to F, with callback context equal to globalObject’s relevant settings object.
-        m_count_queuing_strategy_size_function = realm.create<WebIDL::CallbackType>(*function, relevant_settings_object(*this));
-    }
-
-    return GC::Ref { *m_count_queuing_strategy_size_function };
-}
-
-// https://streams.spec.whatwg.org/#byte-length-queuing-strategy-size-function
-GC::Ref<WebIDL::CallbackType> Window::byte_length_queuing_strategy_size_function()
-{
-    auto& realm = this->realm();
-
-    if (!m_byte_length_queuing_strategy_size_function) {
-        // 1. Let steps be the following steps, given chunk:
-        auto steps = [](JS::VM& vm) {
-            auto chunk = vm.argument(0);
-
-            // 1. Return ? GetV(chunk, "byteLength").
-            return chunk.get(vm, vm.names.byteLength);
-        };
-
-        // 2. Let F be ! CreateBuiltinFunction(steps, 1, "size", « », globalObject’s relevant Realm).
-        auto function = JS::NativeFunction::create(realm, move(steps), 1, "size", &realm);
-
-        // 3. Set globalObject’s byte length queuing strategy size function to a Function that represents a reference to F, with callback context equal to globalObject’s relevant settings object.
-        m_byte_length_queuing_strategy_size_function = realm.create<WebIDL::CallbackType>(*function, relevant_settings_object(*this));
-    }
-
-    return GC::Ref { *m_byte_length_queuing_strategy_size_function };
-}
-
 static bool s_inspector_object_exposed = false;
 static bool s_internals_object_exposed = false;
 

Libraries/LibWeb/HTML/Window.h

@@ -141,9 +141,6 @@ public:
     CrossOriginPropertyDescriptorMap const& cross_origin_property_descriptor_map() const { return m_cross_origin_property_descriptor_map; }
     CrossOriginPropertyDescriptorMap& cross_origin_property_descriptor_map() { return m_cross_origin_property_descriptor_map; }
 
-    GC::Ref<WebIDL::CallbackType> count_queuing_strategy_size_function();
-    GC::Ref<WebIDL::CallbackType> byte_length_queuing_strategy_size_function();
-
     // JS API functions
     GC::Ref<WindowProxy> window() const;
     GC::Ref<WindowProxy> self() const;
@@ -313,12 +310,6 @@ private:
     // https://html.spec.whatwg.org/multipage/interaction.html#last-history-action-activation-timestamp
     HighResolutionTime::DOMHighResTimeStamp m_last_history_action_activation_timestamp { AK::Infinity<double> };
 
-    // https://streams.spec.whatwg.org/#count-queuing-strategy-size-function
-    GC::Ptr<WebIDL::CallbackType> m_count_queuing_strategy_size_function;
-
-    // https://streams.spec.whatwg.org/#byte-length-queuing-strategy-size-function
-    GC::Ptr<WebIDL::CallbackType> m_byte_length_queuing_strategy_size_function;
-
     // https://html.spec.whatwg.org/multipage/nav-history-apis.html#dom-window-status
     // When the Window object is created, the attribute must be set to the empty string. It does not do anything else.
     String m_status;

Libraries/LibWeb/HTML/WorkerGlobalScope.cpp

@@ -45,6 +45,7 @@ void WorkerGlobalScope::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
     WindowOrWorkerGlobalScopeMixin::visit_edges(visitor);
+    UniversalGlobalScopeMixin::visit_edges(visitor);
 
     visitor.visit(m_location);
     visitor.visit(m_navigator);

Libraries/LibWeb/ResizeObserver/ResizeObserver.cpp

@@ -100,7 +100,7 @@ void ResizeObserver::disconnect()
 void ResizeObserver::invoke_callback(ReadonlySpan<GC::Ref<ResizeObserverEntry>> entries) const
 {
     auto& callback = *m_callback;
-    auto& realm = callback.callback_context->realm();
+    auto& realm = callback.callback_context;
 
     auto wrapped_records = MUST(JS::Array::create(realm, 0));
     for (size_t i = 0; i < entries.size(); ++i) {

Libraries/LibWeb/Streams/AbstractOperations.cpp

@@ -5428,7 +5428,7 @@ JS::ThrowCompletionOr<GC::Root<WebIDL::CallbackType>> property_to_callback(JS::V
     if (!property.is_function())
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAFunction, property.to_string_without_side_effects());
 
-    return vm.heap().allocate<WebIDL::CallbackType>(property.as_object(), HTML::incumbent_settings_object(), operation_returns_promise);
+    return vm.heap().allocate<WebIDL::CallbackType>(property.as_object(), HTML::incumbent_realm(), operation_returns_promise);
 }
 
 // https://streams.spec.whatwg.org/#set-up-readable-byte-stream-controller-from-underlying-source

Libraries/LibWeb/Streams/ByteLengthQueuingStrategy.cpp

@@ -7,7 +7,7 @@
 
 #include <LibWeb/Bindings/ByteLengthQueuingStrategyPrototype.h>
 #include <LibWeb/Bindings/Intrinsics.h>
-#include <LibWeb/HTML/Window.h>
+#include <LibWeb/HTML/UniversalGlobalScope.h>
 #include <LibWeb/Streams/ByteLengthQueuingStrategy.h>
 
 namespace Web::Streams {
@@ -34,7 +34,9 @@ ByteLengthQueuingStrategy::~ByteLengthQueuingStrategy() = default;
 GC::Ref<WebIDL::CallbackType> ByteLengthQueuingStrategy::size()
 {
     // 1. Return this's relevant global object's byte length queuing strategy size function.
-    return verify_cast<HTML::Window>(HTML::relevant_global_object(*this)).byte_length_queuing_strategy_size_function();
+    auto* global = dynamic_cast<HTML::UniversalGlobalScopeMixin*>(&HTML::relevant_global_object(*this));
+    VERIFY(global);
+    return global->byte_length_queuing_strategy_size_function();
 }
 
 void ByteLengthQueuingStrategy::initialize(JS::Realm& realm)

Libraries/LibWeb/Streams/CountQueuingStrategy.cpp

@@ -7,7 +7,7 @@
 
 #include <LibWeb/Bindings/CountQueuingStrategyPrototype.h>
 #include <LibWeb/Bindings/Intrinsics.h>
-#include <LibWeb/HTML/Window.h>
+#include <LibWeb/HTML/UniversalGlobalScope.h>
 #include <LibWeb/Streams/CountQueuingStrategy.h>
 
 namespace Web::Streams {
@@ -34,7 +34,9 @@ CountQueuingStrategy::~CountQueuingStrategy() = default;
 GC::Ref<WebIDL::CallbackType> CountQueuingStrategy::size()
 {
     // 1. Return this's relevant global object's count queuing strategy size function.
-    return verify_cast<HTML::Window>(HTML::relevant_global_object(*this)).count_queuing_strategy_size_function();
+    auto* global = dynamic_cast<HTML::UniversalGlobalScopeMixin*>(&HTML::relevant_global_object(*this));
+    VERIFY(global);
+    return global->count_queuing_strategy_size_function();
 }
 
 void CountQueuingStrategy::initialize(JS::Realm& realm)

Libraries/LibWeb/WebIDL/AbstractOperations.cpp

@@ -167,9 +167,8 @@ JS::Completion call_user_object_operation(WebIDL::CallbackType& callback, String
     // 4. Let relevant realm be O’s associated Realm.
     auto& relevant_realm = object->shape().realm();
 
-    // FIXME: We should get the realm directly from the callback context.
     // 5. Let stored realm be value’s callback context.
-    auto& stored_realm = callback.callback_context->realm();
+    auto& stored_realm = callback.callback_context;
 
     // 6. Prepare to run script with relevant realm.
     HTML::prepare_to_run_script(relevant_realm);
@@ -252,9 +251,8 @@ JS::Completion invoke_callback(WebIDL::CallbackType& callback, Optional<JS::Valu
     // 5. Let relevant realm be F’s associated Realm.
     auto& relevant_realm = function_object->shape().realm();
 
-    // FIXME: We should get the realm directly from the callback context.
     // 6. Let stored realm be value’s callback context.
-    auto& stored_realm = callback.callback_context->realm();
+    auto& stored_realm = callback.callback_context;
 
     // 8. Prepare to run script with relevant realm.
     HTML::prepare_to_run_script(relevant_realm);
@@ -297,9 +295,8 @@ JS::Completion construct(WebIDL::CallbackType& callback, GC::MarkedVector<JS::Va
     if (!JS::Value(function_object).is_constructor())
         return relevant_realm.vm().template throw_completion<JS::TypeError>(JS::ErrorType::NotAConstructor, JS::Value(function_object).to_string_without_side_effects());
 
-    // FIXME: We should get the realm directly from the callback context.
     // 4. Let stored realm be callable’s callback context.
-    auto& stored_realm = callback.callback_context->realm();
+    auto& stored_realm = callback.callback_context;
 
     // 5. Prepare to run script with relevant realm.
     HTML::prepare_to_run_script(relevant_realm);

Libraries/LibWeb/WebIDL/CallbackType.cpp

@@ -12,7 +12,7 @@ namespace Web::WebIDL {
 
 GC_DEFINE_ALLOCATOR(CallbackType);
 
-CallbackType::CallbackType(JS::Object& callback, HTML::EnvironmentSettingsObject& callback_context, OperationReturnsPromise operation_returns_promise)
+CallbackType::CallbackType(JS::Object& callback, JS::Realm& callback_context, OperationReturnsPromise operation_returns_promise)
     : callback(callback)
     , callback_context(callback_context)
     , operation_returns_promise(operation_returns_promise)

Libraries/LibWeb/WebIDL/CallbackType.h

@@ -24,12 +24,13 @@ class CallbackType final : public JS::Cell {
     GC_DECLARE_ALLOCATOR(CallbackType);
 
 public:
-    CallbackType(JS::Object& callback, HTML::EnvironmentSettingsObject& callback_context, OperationReturnsPromise = OperationReturnsPromise::No);
+    CallbackType(JS::Object& callback, JS::Realm& callback_context, OperationReturnsPromise = OperationReturnsPromise::No);
 
     GC::Ref<JS::Object> callback;
 
     // https://webidl.spec.whatwg.org/#dfn-callback-context
-    GC::Ref<HTML::EnvironmentSettingsObject> callback_context;
+    // NOTE: This is a Realm per ShadowRealm proposal https://github.com/whatwg/webidl/pull/1437
+    GC::Ref<JS::Realm> callback_context;
 
     // Non-standard property used to distinguish Promise-returning callbacks in callback-related AOs
     OperationReturnsPromise operation_returns_promise;

Libraries/LibWeb/XHR/XMLHttpRequest.cpp

@@ -433,7 +433,7 @@ WebIDL::ExceptionOr<void> XMLHttpRequest::set_request_header(String const& name_
     // 4. If name is not a header name or value is not a header value, then throw a "SyntaxError" DOMException.
     if (!Fetch::Infrastructure::is_header_name(name))
         return WebIDL::SyntaxError::create(realm, "Header name contains invalid characters."_string);
-    if (!Fetch::Infrastructure::is_header_value(value))
+    if (!Fetch::Infrastructure::is_header_value(normalized_value))
         return WebIDL::SyntaxError::create(realm, "Header value contains invalid characters."_string);
 
     auto header = Fetch::Infrastructure::Header {

Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp

@@ -554,7 +554,7 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
         if (!@js_name@@js_suffix@.is_object())
             return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, @js_name@@js_suffix@.to_string_without_side_effects());
 
-        auto callback_type = vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_object(), HTML::incumbent_settings_object());
+        auto callback_type = vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_object(), HTML::incumbent_realm());
         @cpp_name@ = TRY(throw_dom_exception_if_needed(vm, [&] { return @cpp_type@::create(realm, *callback_type); }));
     }
 )~~~");
@@ -563,7 +563,7 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
     if (!@js_name@@js_suffix@.is_object())
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, @js_name@@js_suffix@.to_string_without_side_effects());
 
-    auto callback_type = vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_object(), HTML::incumbent_settings_object());
+    auto callback_type = vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_object(), HTML::incumbent_realm());
     auto @cpp_name@ = adopt_ref(*new @cpp_type@(callback_type));
 )~~~");
         }
@@ -916,16 +916,16 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAFunction, @js_name@@js_suffix@.to_string_without_side_effects());
 )~~~");
         }
-        // 2. Return the IDL callback function type value that represents a reference to the same object that V represents, with the incumbent settings object as the callback context.
+        // 2. Return the IDL callback function type value that represents a reference to the same object that V represents, with the incumbent realm as the callback context.
         if (parameter.type->is_nullable() || callback_function.is_legacy_treat_non_object_as_null) {
             callback_function_generator.append(R"~~~(
     GC::Ptr<WebIDL::CallbackType> @cpp_name@;
     if (@js_name@@js_suffix@.is_object())
-        @cpp_name@ = vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_object(), HTML::incumbent_settings_object(), @operation_returns_promise@);
+        @cpp_name@ = vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_object(), HTML::incumbent_realm(), @operation_returns_promise@);
 )~~~");
         } else {
             callback_function_generator.append(R"~~~(
-    auto @cpp_name@ = vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_object(), HTML::incumbent_settings_object(), @operation_returns_promise@);
+    auto @cpp_name@ = vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_object(), HTML::incumbent_realm(), @operation_returns_promise@);
 )~~~");
         }
     } else if (parameter.type->name() == "sequence") {
@@ -1282,7 +1282,7 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
         if (includes_callable) {
             union_generator.append(R"~~~(
             if (@js_name@@js_suffix@_object.is_function())
-                return vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_function(), HTML::incumbent_settings_object());
+                return vm.heap().allocate<WebIDL::CallbackType>(@js_name@@js_suffix@.as_function(), HTML::incumbent_realm());
 )~~~");
         }
 

Tests/LibWeb/Text/expected/Streams/QueuingStrategy-same-instance.txt

@@ -0,0 +1,5 @@
+CountQueuingStrategy | size1 === size2 -> true
+ByteLengthQueuingStrategy | size1 === size2 -> true
+
+CountQueuingStrategy | size1 === size2 -> true
+ByteLengthQueuingStrategy | size1 === size2 -> true

Tests/LibWeb/Text/expected/wpt-import/css/css-grid/grid-definition/grid-support-grid-template-areas-001.txt

@@ -0,0 +1,56 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 45 tests
+
+36 Pass
+9 Fail
+Details
+Result	Test Name	MessagePass	'grid' with: grid-template-areas: none;	
+Pass	'grid' with: grid-template-areas: "a";	
+Pass	'grid' with: grid-template-areas: ".";	
+Pass	'grid' with: grid-template-areas: "lower UPPER 10 -minus _low 1-st ©copy_right line¶";	
+Pass	'grid' with: grid-template-areas: "a b";	
+Pass	'grid' with: grid-template-areas: "a b" "c d";	
+Pass	'grid' with: grid-template-areas: "a b" "c d";	
+Pass	'grid' with: grid-template-areas: "a b""c d";	
+Pass	'grid' with: grid-template-areas: "a b" "c d";	
+Pass	'grid' with: grid-template-areas: "a b" "c d";	
+Pass	'grid' with: grid-template-areas: "a b" "a b";	
+Pass	'grid' with: grid-template-areas: "a a" "b b";	
+Pass	'grid' with: grid-template-areas: ". a ." "b a c";	
+Pass	'grid' with: grid-template-areas: ".. a ..." "b a c";	
+Pass	'grid' with: grid-template-areas: ".a..." "b a c";	
+Pass	'grid' with: grid-template-areas: "head head" "nav main" "foot .";	
+Pass	'grid' with: grid-template-areas: "head head" "nav main" "foot ....";	
+Pass	'grid' with: grid-template-areas: "head head" "nav main" "foot.";	
+Pass	'grid' with: grid-template-areas: ". header header ." "nav main main main" "nav footer footer .";	
+Pass	'grid' with: grid-template-areas: "... header header ...." "nav main main main" "nav footer footer ....";	
+Pass	'grid' with: grid-template-areas: "...header header...." "nav main main main" "nav footer footer....";	
+Pass	'grid' with: grid-template-areas: "title stats" "score stats" "board board" "ctrls ctrls";	
+Pass	'grid' with: grid-template-areas: "title board" "stats board" "score ctrls";	
+Pass	'grid' with: grid-template-areas: ". a" "b a" ". a";	
+Pass	'grid' with: grid-template-areas: ".. a" "b a" "... a";	
+Pass	'grid' with: grid-template-areas: "..a" "b a" ".a";	
+Pass	'grid' with: grid-template-areas: "a a a" "b b b";	
+Pass	'grid' with: grid-template-areas: ". ." "a a";	
+Pass	'grid' with: grid-template-areas: "... ...." "a a";	
+Pass	'grid' with: grid-template-areas: a;	
+Pass	'grid' with: grid-template-areas: "a" "b c";	
+Pass	'grid' with: grid-template-areas: "a b" "c" "d e";	
+Pass	'grid' with: grid-template-areas: "a b c" "d e";	
+Pass	'grid' with: grid-template-areas: "a b"-"c d";	
+Pass	'grid' with: grid-template-areas: "a b" - "c d";	
+Pass	'grid' with: grid-template-areas: "a b" . "c d";	
+Fail	'grid' with: grid-template-areas: "a b a";	
+Fail	'grid' with: grid-template-areas: "a" "b" "a";	
+Fail	'grid' with: grid-template-areas: "a b" "b b";	
+Fail	'grid' with: grid-template-areas: "b a" "b b";	
+Fail	'grid' with: grid-template-areas: "a b" "b a";	
+Fail	'grid' with: grid-template-areas: "a ." ". a";	
+Fail	'grid' with: grid-template-areas: ",";	
+Fail	'grid' with: grid-template-areas: "10%";	
+Fail	'grid' with: grid-template-areas: "USD$";	

Tests/LibWeb/Text/expected/wpt-import/css/css-grid/parsing/grid-shorthand-serialization.txt

@@ -6,15 +6,15 @@ Rerun
 
 Found 121 tests
 
-26 Pass
+31 Pass
-95 Fail
+90 Fail
 Details
 Result	Test Name	MessageFail	e.style.cssText = grid: auto-flow auto / 100px 100px should set grid	
 Fail	e.style.cssText = grid: auto-flow auto / 100px 100px should set grid-template-areas	
 Pass	e.style.cssText = grid: auto-flow auto / 100px 100px; grid-template-areas: "one two" "three four" should set grid	
 Fail	e.style.cssText = grid: auto-flow auto / 100px 100px; grid-template-areas: "one two" "three four" should set grid-auto-flow	
 Fail	e.style.cssText = grid: auto-flow auto / 100px 100px; grid-template-areas: "one two" "three four" should set grid-auto-rows	
-Fail	e.style.cssText = grid: auto-flow auto / 100px 100px; grid-template-areas: "one two" "three four" should set grid-template-areas	
+Pass	e.style.cssText = grid: auto-flow auto / 100px 100px; grid-template-areas: "one two" "three four" should set grid-template-areas	
 Fail	e.style.cssText = grid: 30px 40px / 50px 60px; grid-auto-flow: column should set grid	
 Pass	e.style.cssText = grid: 30px 40px / 50px 60px; grid-auto-flow: column should set grid-auto-flow	
 Fail	e.style.cssText = grid: 30px 40px / 50px 60px; grid-auto-flow: column should set grid-template	
@@ -115,18 +115,18 @@ Fail	e.style.cssText = grid: auto-flow 1px / none; grid-template-rows: repeat(au
 Fail	e.style.cssText = grid: auto-flow 1px / none; grid-template-rows: repeat(auto-fit, 3px) should set grid-template-columns	
 Fail	e.style.cssText = grid: auto-flow 1px / none; grid-template-rows: repeat(auto-fit, 3px) should set grid-template-rows	
 Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 3px); grid-template-areas: "one two" "three four" should set grid	
-Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 3px); grid-template-areas: "one two" "three four" should set grid-template-areas	
+Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 3px); grid-template-areas: "one two" "three four" should set grid-template-areas	
 Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 3px); grid-template-areas: "one two" "three four" should set grid-template-columns	
 Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 3px); grid-template-areas: "one two" "three four" should set grid-template-rows	
 Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 1fr); grid-template-areas: "one two" "three four" should set grid	
-Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 1fr); grid-template-areas: "one two" "three four" should set grid-template-areas	
+Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 1fr); grid-template-areas: "one two" "three four" should set grid-template-areas	
 Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 1fr); grid-template-areas: "one two" "three four" should set grid-template-columns	
 Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(2, 1fr); grid-template-areas: "one two" "three four" should set grid-template-rows	
 Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fill, 3px); grid-template-areas: "one two" "three four" should set grid	
-Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fill, 3px); grid-template-areas: "one two" "three four" should set grid-template-areas	
+Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fill, 3px); grid-template-areas: "one two" "three four" should set grid-template-areas	
 Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fill, 3px); grid-template-areas: "one two" "three four" should set grid-template-columns	
 Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fill, 3px); grid-template-areas: "one two" "three four" should set grid-template-rows	
 Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fit, 3px); grid-template-areas: "one two" "three four" should set grid	
-Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fit, 3px); grid-template-areas: "one two" "three four" should set grid-template-areas	
+Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fit, 3px); grid-template-areas: "one two" "three four" should set grid-template-areas	
 Fail	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fit, 3px); grid-template-areas: "one two" "three four" should set grid-template-columns	
 Pass	e.style.cssText = grid-template-rows: auto auto; grid-template-columns: repeat(auto-fit, 3px); grid-template-areas: "one two" "three four" should set grid-template-rows	

Tests/LibWeb/Text/expected/wpt-import/css/css-grid/parsing/grid-shorthand.txt

@@ -6,8 +6,8 @@ Rerun
 
 Found 63 tests
 
-18 Pass
+21 Pass
-45 Fail
+42 Fail
 Details
 Result	Test Name	MessageFail	e.style['grid'] = "none" should set grid-auto-columns	
 Fail	e.style['grid'] = "none" should set grid-auto-flow	
@@ -40,21 +40,21 @@ Pass	e.style['grid'] = "fit-content(calc(-0.5em + 10px)) / fit-content(calc(0.5e
 Fail	e.style['grid'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-auto-columns	
 Fail	e.style['grid'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-auto-flow	
 Fail	e.style['grid'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-auto-rows	
-Fail	e.style['grid'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-template-areas	
+Pass	e.style['grid'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-template-areas	
 Pass	e.style['grid'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-template-columns	
 Fail	e.style['grid'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-template-rows	
 Pass	e.style['grid'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should not set unrelated longhands	
 Fail	e.style['grid'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-auto-columns	
 Fail	e.style['grid'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-auto-flow	
 Fail	e.style['grid'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-auto-rows	
-Fail	e.style['grid'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-template-areas	
+Pass	e.style['grid'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-template-areas	
 Pass	e.style['grid'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-template-columns	
 Fail	e.style['grid'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-template-rows	
 Pass	e.style['grid'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should not set unrelated longhands	
 Fail	e.style['grid'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-auto-columns	
 Fail	e.style['grid'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-auto-flow	
 Fail	e.style['grid'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-auto-rows	
-Fail	e.style['grid'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-template-areas	
+Pass	e.style['grid'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-template-areas	
 Fail	e.style['grid'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-template-columns	
 Fail	e.style['grid'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-template-rows	
 Pass	e.style['grid'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should not set unrelated longhands	

Tests/LibWeb/Text/expected/wpt-import/css/css-grid/parsing/grid-template-areas-computed.txt

@@ -6,15 +6,14 @@ Rerun
 
 Found 9 tests
 
-1 Pass
+9 Pass
-8 Fail
 Details
 Result	Test Name	MessagePass	Property grid-template-areas value 'none'	
-Fail	Property grid-template-areas value '"first"'	
+Pass	Property grid-template-areas value '"first"'	
-Fail	Property grid-template-areas value '"first second"'	
+Pass	Property grid-template-areas value '"first second"'	
-Fail	Property grid-template-areas value '"1st 2nd 3rd"'	
+Pass	Property grid-template-areas value '"1st 2nd 3rd"'	
-Fail	Property grid-template-areas value '"first second" "third fourth"'	
+Pass	Property grid-template-areas value '"first second" "third fourth"'	
-Fail	Property grid-template-areas value '"first second" "third ." "1st 2nd" "3rd 4th"'	
+Pass	Property grid-template-areas value '"first second" "third ." "1st 2nd" "3rd 4th"'	
-Fail	Property grid-template-areas value '" a b "'	
+Pass	Property grid-template-areas value '" a b "'	
-Fail	Property grid-template-areas value '"c d"'	
+Pass	Property grid-template-areas value '"c d"'	
-Fail	Property grid-template-areas value '"first ..."'	
+Pass	Property grid-template-areas value '"first ..."'	

Tests/LibWeb/Text/expected/wpt-import/css/css-grid/parsing/grid-template-areas-invalid.txt

@@ -6,17 +6,16 @@ Rerun
 
 Found 11 tests
 
-6 Pass
+11 Pass
-5 Fail
 Details
 Result	Test Name	MessagePass	e.style['grid-template-areas'] = "auto" should not set the property value	
 Pass	e.style['grid-template-areas'] = "none \"first\"" should not set the property value	
 Pass	e.style['grid-template-areas'] = "\"first\" none" should not set the property value	
 Pass	e.style['grid-template-areas'] = "\"\"" should not set the property value	
 Pass	e.style['grid-template-areas'] = "\" \"" should not set the property value	
-Fail	e.style['grid-template-areas'] = "\".\" \"\"" should not set the property value	
+Pass	e.style['grid-template-areas'] = "\".\" \"\"" should not set the property value	
-Fail	e.style['grid-template-areas'] = "\".\" \" \"" should not set the property value	
+Pass	e.style['grid-template-areas'] = "\".\" \" \"" should not set the property value	
-Fail	e.style['grid-template-areas'] = "\"first\" \"\"" should not set the property value	
+Pass	e.style['grid-template-areas'] = "\"first\" \"\"" should not set the property value	
-Fail	e.style['grid-template-areas'] = "\"first\" \"\" \"second\"" should not set the property value	
+Pass	e.style['grid-template-areas'] = "\"first\" \"\" \"second\"" should not set the property value	
-Fail	e.style['grid-template-areas'] = "\"first\" \" \"" should not set the property value	
+Pass	e.style['grid-template-areas'] = "\"first\" \" \"" should not set the property value	
 Pass	e.style['grid-template-areas'] = "\"\" none" should not set the property value	

Tests/LibWeb/Text/expected/wpt-import/css/css-grid/parsing/grid-template-areas-one-cell.txt

@@ -6,12 +6,11 @@ Rerun
 
 Found 6 tests
 
-4 Pass
+6 Pass
-2 Fail
 Details
 Result	Test Name	MessagePass	"grid-template-areas: 'a';" should be valid.	
 Pass	"grid-template-areas: '.';" should be valid.	
 Pass	"grid-template-areas: '';" should be invalid.	
-Fail	"grid-template-areas: '' '';" should be invalid.	
+Pass	"grid-template-areas: '' '';" should be invalid.	
-Fail	"grid-template-areas: '$';" should be invalid.	
+Pass	"grid-template-areas: '$';" should be invalid.	
 Pass	"grid-template-areas: ' ';" should be invalid.	

Tests/LibWeb/Text/expected/wpt-import/css/css-grid/parsing/grid-template-areas-valid.txt

@@ -6,15 +6,14 @@ Rerun
 
 Found 9 tests
 
-1 Pass
+9 Pass
-8 Fail
 Details
 Result	Test Name	MessagePass	e.style['grid-template-areas'] = "none" should set the property value	
-Fail	e.style['grid-template-areas'] = "\"first\"" should set the property value	
+Pass	e.style['grid-template-areas'] = "\"first\"" should set the property value	
-Fail	e.style['grid-template-areas'] = "\"first second\"" should set the property value	
+Pass	e.style['grid-template-areas'] = "\"first second\"" should set the property value	
-Fail	e.style['grid-template-areas'] = "\"1st 2nd 3rd\"" should set the property value	
+Pass	e.style['grid-template-areas'] = "\"1st 2nd 3rd\"" should set the property value	
-Fail	e.style['grid-template-areas'] = "\"first second\" \"third fourth\"" should set the property value	
+Pass	e.style['grid-template-areas'] = "\"first second\" \"third fourth\"" should set the property value	
-Fail	e.style['grid-template-areas'] = "\"first second\" \"third .\" \"1st 2nd\" \"3rd 4th\"" should set the property value	
+Pass	e.style['grid-template-areas'] = "\"first second\" \"third .\" \"1st 2nd\" \"3rd 4th\"" should set the property value	
-Fail	e.style['grid-template-areas'] = "\" a \t b \"" should set the property value	
+Pass	e.style['grid-template-areas'] = "\" a \t b \"" should set the property value	
-Fail	e.style['grid-template-areas'] = "\"c\td\"" should set the property value	
+Pass	e.style['grid-template-areas'] = "\"c\td\"" should set the property value	
-Fail	e.style['grid-template-areas'] = "\"first ...\"" should set the property value	
+Pass	e.style['grid-template-areas'] = "\"first ...\"" should set the property value	

Tests/LibWeb/Text/expected/wpt-import/css/css-grid/parsing/grid-template-shorthand.txt

@@ -6,8 +6,8 @@ Rerun
 
 Found 24 tests
 
-15 Pass
+18 Pass
-9 Fail
+6 Fail
 Details
 Result	Test Name	MessagePass	e.style['grid-template'] = "none" should set grid-template-areas	
 Fail	e.style['grid-template'] = "none" should set grid-template-columns	
@@ -21,15 +21,15 @@ Pass	e.style['grid-template'] = "fit-content(calc(-0.5em + 10px)) / fit-content(
 Pass	e.style['grid-template'] = "fit-content(calc(-0.5em + 10px)) / fit-content(calc(0.5em + 10px))" should set grid-template-columns	
 Pass	e.style['grid-template'] = "fit-content(calc(-0.5em + 10px)) / fit-content(calc(0.5em + 10px))" should set grid-template-rows	
 Pass	e.style['grid-template'] = "fit-content(calc(-0.5em + 10px)) / fit-content(calc(0.5em + 10px))" should not set unrelated longhands	
-Fail	e.style['grid-template'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-template-areas	
+Pass	e.style['grid-template'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-template-areas	
 Pass	e.style['grid-template'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-template-columns	
 Fail	e.style['grid-template'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should set grid-template-rows	
 Pass	e.style['grid-template'] = "[header-top] \"a a a\" [header-bottom] [main-top] \"b b b\" 1fr [main-bottom] / auto 1fr auto" should not set unrelated longhands	
-Fail	e.style['grid-template'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-template-areas	
+Pass	e.style['grid-template'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-template-areas	
 Pass	e.style['grid-template'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-template-columns	
 Fail	e.style['grid-template'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should set grid-template-rows	
 Pass	e.style['grid-template'] = " \"a a a\" \"b b b\" 1fr/ auto 1fr auto" should not set unrelated longhands	
-Fail	e.style['grid-template'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-template-areas	
+Pass	e.style['grid-template'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-template-areas	
 Fail	e.style['grid-template'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-template-columns	
 Fail	e.style['grid-template'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should set grid-template-rows	
 Pass	e.style['grid-template'] = " [] \"a a a\" [] [] \"b b b\" 1fr [] / [] auto 1fr [] auto []" should not set unrelated longhands	

Tests/LibWeb/Text/expected/wpt-import/xhr/blob-range.any.txt

@@ -0,0 +1,37 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 27 tests
+
+27 Pass
+Details
+Result	Test Name	MessagePass	A simple blob range request.	
+Pass	A blob range request with no type.	
+Pass	A blob range request with no end.	
+Pass	A blob range request with no start.	
+Pass	A simple blob range request with whitespace.	
+Pass	Blob content with short content and a large range end	
+Pass	Blob content with short content and a range end matching content length	
+Pass	Blob range with whitespace before and after hyphen	
+Pass	Blob range with whitespace after hyphen	
+Pass	Blob range with whitespace around equals sign	
+Pass	Blob range with no value	
+Pass	Blob range with incorrect range header	
+Pass	Blob range with incorrect range header #2	
+Pass	Blob range with incorrect range header #3	
+Pass	Blob range request with multiple range values	
+Pass	Blob range request with multiple range values and whitespace	
+Pass	Blob range request with trailing comma	
+Pass	Blob range with no start or end	
+Pass	Blob range request with short range end	
+Pass	Blob range start should be an ASCII digit	
+Pass	Blob range should have a dash	
+Pass	Blob range end should be an ASCII digit	
+Pass	Blob range should include '-'	
+Pass	Blob range should include '='	
+Pass	Blob range should include 'bytes='	
+Pass	Blob content with short content and a large range start	
+Pass	Blob content with short content and a range start matching the content length	

Tests/LibWeb/Text/input/Streams/QueuingStrategy-same-instance.html

@@ -0,0 +1,25 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        const realm = new ShadowRealm();
+        const result = realm.evaluate(`
+            (() => {
+                let str = "";
+                for (const QueuingStrategy of [CountQueuingStrategy, ByteLengthQueuingStrategy]) {
+                    const size1 = (new QueuingStrategy({ highWaterMark: 5 })).size;
+                    const size2 = (new QueuingStrategy({ highWaterMark: 10 })).size;
+                    str += \`\${QueuingStrategy.name} | size1 === size2 -> \${size1 === size2}\n\`;
+                }
+                return str;
+            })()
+        `);
+
+        println(result);
+
+        for (const QueuingStrategy of [CountQueuingStrategy, ByteLengthQueuingStrategy]) {
+            const size1 = (new QueuingStrategy({ highWaterMark: 5 })).size;
+            const size2 = (new QueuingStrategy({ highWaterMark: 10 })).size;
+            println(`${QueuingStrategy.name} | size1 === size2 -> ${size1 === size2}`);
+        }
+    })
+</script>

Tests/LibWeb/Text/input/wpt-import/css/css-grid/grid-definition/grid-support-grid-template-areas-001.html

@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Support for 'grid-template-ares' property</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="http://www.w3.org/TR/css-grid-1/#grid-template-areas-property" title="5.2 Named Areas: the 'grid-template-areas' property">
+<meta name="flags" content="ahem dom">
+<meta name="assert" content="This test checks that 'grid-template-areas' is supported in a grid. So you can define the grid structure.">
+<script src="../../../resources/testharness.js"></script>
+<script src="../../../resources/testharnessreport.js"></script>
+<script src="support/testing-utils.js"></script>
+<style>
+  #grid {
+    display: grid;
+  }
+</style>
+<div id="log"></div>
+
+<div id="grid"></div>
+
+<script>
+  // Single values.
+  TestingUtils.testGridTemplateAreas('grid', 'none', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a"', '"a"');
+  TestingUtils.testGridTemplateAreas('grid', '"."', '"."');
+  TestingUtils.testGridTemplateAreas('grid', '"lower UPPER 10 -minus _low 1-st ©copy_right line¶"', '"lower UPPER 10 -minus _low 1-st ©copy_right line¶"');
+  TestingUtils.testGridTemplateAreas('grid', '"a b"', '"a b"');
+  TestingUtils.testGridTemplateAreas('grid', '"a b" "c d"', '"a b" "c d"');
+  TestingUtils.testGridTemplateAreas('grid', '"a   b"   "c   d"', '"a b" "c d"');
+  TestingUtils.testGridTemplateAreas('grid', '"a b""c d"', '"a b" "c d"');
+  TestingUtils.testGridTemplateAreas('grid', '"a b"\t"c d"', '"a b" "c d"');
+  TestingUtils.testGridTemplateAreas('grid', '"a b"\n"c d"', '"a b" "c d"');
+  TestingUtils.testGridTemplateAreas('grid', '"a b" "a b"', '"a b" "a b"');
+  TestingUtils.testGridTemplateAreas('grid', '"a a" "b b"', '"a a" "b b"');
+  TestingUtils.testGridTemplateAreas('grid', '". a ." "b a c"', '". a ." "b a c"');
+  TestingUtils.testGridTemplateAreas('grid', '".. a ..." "b a c"', '". a ." "b a c"');
+  TestingUtils.testGridTemplateAreas('grid', '".a..." "b a c"', '". a ." "b a c"');
+  TestingUtils.testGridTemplateAreas('grid', '"head head" "nav main" "foot ."', '"head head" "nav main" "foot ."');
+  TestingUtils.testGridTemplateAreas('grid', '"head head" "nav main" "foot ...."', '"head head" "nav main" "foot ."');
+  TestingUtils.testGridTemplateAreas('grid', '"head head" "nav main" "foot."', '"head head" "nav main" "foot ."');
+  TestingUtils.testGridTemplateAreas('grid', '". header header ." "nav main main main" "nav footer footer ."', '". header header ." "nav main main main" "nav footer footer ."');
+  TestingUtils.testGridTemplateAreas('grid', '"... header header ...." "nav main main main" "nav footer footer ...."', '". header header ." "nav main main main" "nav footer footer ."');
+  TestingUtils.testGridTemplateAreas('grid', '"...header header...." "nav main main main" "nav footer footer...."', '". header header ." "nav main main main" "nav footer footer ."');
+  TestingUtils.testGridTemplateAreas('grid', '"title stats" "score stats" "board board" "ctrls ctrls"', '"title stats" "score stats" "board board" "ctrls ctrls"');
+  TestingUtils.testGridTemplateAreas('grid', '"title board" "stats board" "score ctrls"', '"title board" "stats board" "score ctrls"');
+  TestingUtils.testGridTemplateAreas('grid', '". a" "b a" ". a"', '". a" "b a" ". a"');
+  TestingUtils.testGridTemplateAreas('grid', '".. a" "b a" "... a"', '". a" "b a" ". a"');
+  TestingUtils.testGridTemplateAreas('grid', '"..a" "b a" ".a"', '". a" "b a" ". a"');
+  TestingUtils.testGridTemplateAreas('grid', '"a a a" "b b b"', '"a a a" "b b b"');
+  TestingUtils.testGridTemplateAreas('grid', '". ." "a a"', '". ." "a a"');
+  TestingUtils.testGridTemplateAreas('grid', '"... ...." "a a"', '". ." "a a"');
+
+  // Reset values.
+  document.getElementById('grid').style.gridTemplateAreas = '';
+
+  // Wrong values.
+  TestingUtils.testGridTemplateAreas('grid', 'a', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a" "b c"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a b" "c" "d e"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a b c" "d e"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a b"-"c d"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a b" - "c d"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a b" . "c d"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a b a"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a" "b" "a"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a b" "b b"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"b a" "b b"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a b" "b a"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"a ." ". a"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '","', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"10%"', 'none');
+  TestingUtils.testGridTemplateAreas('grid', '"USD$"', 'none');
+</script>

Tests/LibWeb/Text/input/wpt-import/css/css-grid/grid-definition/support/testing-utils.js

@@ -0,0 +1,43 @@
+var TestingUtils = (function() {
+
+    function checkGridTemplateColumns(element, value) {
+        if (!Array.isArray(value))
+            value = new Array(value);
+        assert_in_array(getComputedStyle(element).gridTemplateColumns, value, "gridTemplateColumns");
+    }
+
+    function checkGridTemplateRows(element, value) {
+        if (!Array.isArray(value))
+            value = new Array(value);
+        assert_in_array(getComputedStyle(element).gridTemplateRows, value, "gridTemplateRows");
+    }
+
+    function testGridTemplateColumnsRows(gridId, columnsStyle, rowsStyle, columnsComputedValue, rowsComputedValue, label) {
+        test(function() {
+            var grid = document.getElementById(gridId);
+            grid.style.gridTemplateColumns = columnsStyle;
+            grid.style.gridTemplateRows = rowsStyle;
+            checkGridTemplateColumns(grid, columnsComputedValue);
+            checkGridTemplateRows(grid, rowsComputedValue);
+        }, (label ? label + " " : "") + "'" + gridId + "' with: grid-template-columns: " + columnsStyle  + "; and grid-template-rows: " + rowsStyle + ";");
+    }
+
+    function checkGridTemplateAreas(element, value) {
+        if (!Array.isArray(value))
+            value = new Array(value);
+        assert_in_array(getComputedStyle(element).gridTemplateAreas, value, "gridTemplateAreas");
+    }
+
+    function testGridTemplateAreas(gridId, style, value) {
+        test(function() {
+            var grid = document.getElementById(gridId);
+            grid.style.gridTemplateAreas = style;
+            checkGridTemplateAreas(grid, value);
+        }, "'" + gridId + "' with: grid-template-areas: " + style + ";");
+    }
+
+    return {
+        testGridTemplateColumnsRows: testGridTemplateColumnsRows,
+        testGridTemplateAreas: testGridTemplateAreas
+    }
+})();

Tests/LibWeb/Text/input/wpt-import/xhr/blob-range.any.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<meta charset=utf-8>
+
+<script>
+self.GLOBAL = {
+  isWindow: function() { return true; },
+  isWorker: function() { return false; },
+  isShadowRealm: function() { return false; },
+};
+</script>
+<script src="../resources/testharness.js"></script>
+<script src="../resources/testharnessreport.js"></script>
+
+<div id=log></div>
+<script src="../xhr/blob-range.any.js"></script>

Tests/LibWeb/Text/input/wpt-import/xhr/blob-range.any.js

@@ -0,0 +1,246 @@
+// See also /fetch/range/blob.any.js
+
+const supportedBlobRange = [
+  {
+    name: "A simple blob range request.",
+    data: ["A simple Hello, World! example"],
+    type: "text/plain",
+    range: "bytes=9-21",
+    content_length: 13,
+    content_range: "bytes 9-21/30",
+    result: "Hello, World!",
+  },
+  {
+    name: "A blob range request with no type.",
+    data: ["A simple Hello, World! example"],
+    type: undefined,
+    range: "bytes=9-21",
+    content_length: 13,
+    content_range: "bytes 9-21/30",
+    result: "Hello, World!",
+  },
+  {
+    name: "A blob range request with no end.",
+    data: ["Range with no end"],
+    type: "text/plain",
+    range: "bytes=11-",
+    content_length: 6,
+    content_range: "bytes 11-16/17",
+    result: "no end",
+  },
+  {
+    name: "A blob range request with no start.",
+    data: ["Range with no start"],
+    type: "text/plain",
+    range: "bytes=-8",
+    content_length: 8,
+    content_range: "bytes 11-18/19",
+    result: "no start",
+  },
+  {
+    name: "A simple blob range request with whitespace.",
+    data: ["A simple Hello, World! example"],
+    type: "text/plain",
+    range: "bytes= \t9-21",
+    content_length: 13,
+    content_range: "bytes 9-21/30",
+    result: "Hello, World!",
+  },
+  {
+    name: "Blob content with short content and a large range end",
+    data: ["Not much here"],
+    type: "text/plain",
+    range: "bytes=4-100000000000",
+    content_length: 9,
+    content_range: "bytes 4-12/13",
+    result: "much here",
+  },
+  {
+    name: "Blob content with short content and a range end matching content length",
+    data: ["Not much here"],
+    type: "text/plain",
+    range: "bytes=4-13",
+    content_length: 9,
+    content_range: "bytes 4-12/13",
+    result: "much here",
+  },
+  {
+    name: "Blob range with whitespace before and after hyphen",
+    data: ["Valid whitespace #1"],
+    type: "text/plain",
+    range: "bytes=5 - 10",
+    content_length: 6,
+    content_range: "bytes 5-10/19",
+    result: " white",
+  },
+  {
+    name: "Blob range with whitespace after hyphen",
+    data: ["Valid whitespace #2"],
+    type: "text/plain",
+    range: "bytes=-\t 5",
+    content_length: 5,
+    content_range: "bytes 14-18/19",
+    result: "ce #2",
+  },
+  {
+    name: "Blob range with whitespace around equals sign",
+    data: ["Valid whitespace #3"],
+    type: "text/plain",
+    range: "bytes \t =\t 6-",
+    content_length: 13,
+    content_range: "bytes 6-18/19",
+    result: "whitespace #3",
+  },
+];
+
+const unsupportedBlobRange = [
+  {
+    name: "Blob range with no value",
+    data: ["Blob range should have a value"],
+    type: "text/plain",
+    range: "",
+  },
+  {
+    name: "Blob range with incorrect range header",
+    data: ["A"],
+    type: "text/plain",
+    range: "byte=0-"
+  },
+  {
+    name: "Blob range with incorrect range header #2",
+    data: ["A"],
+    type: "text/plain",
+    range: "bytes"
+  },
+  {
+    name: "Blob range with incorrect range header #3",
+    data: ["A"],
+    type: "text/plain",
+    range: "bytes\t \t"
+  },
+  {
+    name: "Blob range request with multiple range values",
+    data: ["Multiple ranges are not currently supported"],
+    type: "text/plain",
+    range: "bytes=0-5,15-",
+  },
+  {
+    name: "Blob range request with multiple range values and whitespace",
+    data: ["Multiple ranges are not currently supported"],
+    type: "text/plain",
+    range: "bytes=0-5, 15-",
+  },
+  {
+    name: "Blob range request with trailing comma",
+    data: ["Range with invalid trailing comma"],
+    type: "text/plain",
+    range: "bytes=0-5,",
+  },
+  {
+    name: "Blob range with no start or end",
+    data: ["Range with no start or end"],
+    type: "text/plain",
+    range: "bytes=-",
+  },
+  {
+    name: "Blob range request with short range end",
+    data: ["Range end should be greater than range start"],
+    type: "text/plain",
+    range: "bytes=10-5",
+  },
+  {
+    name: "Blob range start should be an ASCII digit",
+    data: ["Range start must be an ASCII digit"],
+    type: "text/plain",
+    range: "bytes=x-5",
+  },
+  {
+    name: "Blob range should have a dash",
+    data: ["Blob range should have a dash"],
+    type: "text/plain",
+    range: "bytes=5",
+  },
+  {
+    name: "Blob range end should be an ASCII digit",
+    data: ["Range end must be an ASCII digit"],
+    type: "text/plain",
+    range: "bytes=5-x",
+  },
+  {
+    name: "Blob range should include '-'",
+    data: ["Range end must include '-'"],
+    type: "text/plain",
+    range: "bytes=x",
+  },
+  {
+    name: "Blob range should include '='",
+    data: ["Range end must include '='"],
+    type: "text/plain",
+    range: "bytes 5-",
+  },
+  {
+    name: "Blob range should include 'bytes='",
+    data: ["Range end must include 'bytes='"],
+    type: "text/plain",
+    range: "5-",
+  },
+  {
+    name: "Blob content with short content and a large range start",
+    data: ["Not much here"],
+    type: "text/plain",
+    range: "bytes=100000-",
+  },
+  {
+    name: "Blob content with short content and a range start matching the content length",
+    data: ["Not much here"],
+    type: "text/plain",
+    range: "bytes=13-",
+  },
+];
+
+supportedBlobRange.forEach(({ name, data, type, range, content_length, content_range, result }) => {
+  promise_test(async t => {
+    const blob = new Blob(data, { "type" : type });
+    const blobURL = URL.createObjectURL(blob);
+    t.add_cleanup(() => URL.revokeObjectURL(blobURL));
+    const xhr = new XMLHttpRequest();
+    xhr.open("GET", blobURL);
+    xhr.responseType = "text";
+    xhr.setRequestHeader("Range", range);
+    await new Promise(resolve => {
+      xhr.onloadend = resolve;
+      xhr.send();
+    });
+    assert_equals(xhr.status, 206, "HTTP status is 206");
+    assert_equals(xhr.getResponseHeader("Content-Type"), type || "", "Content-Type is " + xhr.getResponseHeader("Content-Type"));
+    assert_equals(xhr.getResponseHeader("Content-Length"), content_length.toString(), "Content-Length is " + xhr.getResponseHeader("Content-Length"));
+    assert_equals(xhr.getResponseHeader("Content-Range"), content_range, "Content-Range is " + xhr.getResponseHeader("Content-Range"));
+    assert_equals(xhr.responseText, result, "Response's body is correct");
+    const all = xhr.getAllResponseHeaders().toLowerCase();
+    assert_true(all.includes(`content-type: ${type || ""}`), "Expected Content-Type in getAllResponseHeaders()");
+    assert_true(all.includes(`content-length: ${content_length}`), "Expected Content-Length in getAllResponseHeaders()");
+    assert_true(all.includes(`content-range: ${content_range}`), "Expected Content-Range in getAllResponseHeaders()")
+  }, name);
+});
+
+unsupportedBlobRange.forEach(({ name, data, type, range }) => {
+  promise_test(t => {
+    const blob = new Blob(data, { "type" : type });
+    const blobURL = URL.createObjectURL(blob);
+    t.add_cleanup(() => URL.revokeObjectURL(blobURL));
+
+    const xhr = new XMLHttpRequest();
+    xhr.open("GET", blobURL, false);
+    xhr.setRequestHeader("Range", range);
+    assert_throws_dom("NetworkError", () => xhr.send());
+
+    xhr.open("GET", blobURL);
+    xhr.setRequestHeader("Range", range);
+    xhr.responseType = "text";
+    return new Promise((resolve, reject) => {
+      xhr.onload = reject;
+      xhr.onerror = resolve;
+      xhr.send();
+    });
+  }, name);
+});