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LibWeb: Use an infallible method to add attributes to nodes

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In the HTML parser spec, there are 2 instances of the following text:

    add the attribute and its corresponding value to that element

The "add the attribute" text does not have a corresponding spec link to
actually specify what to do. We currently use `set_attribute`, which can
throw an exception if the attribute name contains an invalid character
(such as '<'). Instead, switch to `append_attribute`, which allows such
attribute names. This behavior matches Firefox.

Note we cannot yet make the unclosed-html-element.html test match the
expectations of the unclosed-body-element.html due to another bug that
would prevent checking if the expected element has the right attribute.
That will be fixed in an upcoming commit.
This commit is contained in:
Timothy Flynn 2024-07-29 17:14:34 -04:00 committed by Andreas Kling
parent c1b0e180ba
commit 9fe35ddddf
Notes: github-actions[bot] 2024-07-30 07:42:37 +00:00 
Author: https://github.com/trflynn89
Commit: https://github.com/LadybirdBrowser/ladybird/commit/9fe35ddddf8
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/894
5 changed files with 24 additions and 3 deletions
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1
Tests/LibWeb/Text/expected/unclosed-body-element.txt Normal file
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@ -0,0 +1 @@
Body element has '<pre' attribute: true

1
Tests/LibWeb/Text/expected/unclosed-html-element.txt Normal file
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@ -0,0 +1 @@
PASS (didn't crash)

10
Tests/LibWeb/Text/input/unclosed-body-element.html Normal file
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@ -0,0 +1,10 @@
<div>
<body
<pre>
<script src="include.js"></script>
<script>
test(() => {
println(`Body element has '<pre' attribute: ${document.body.hasAttribute('<pre')}`);
});
</script>

10
Tests/LibWeb/Text/input/unclosed-html-element.html Normal file
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@ -0,0 +1,10 @@
<link>
<html
<head>
<script src="include.js"></script>
<script>
test(() => {
println("PASS (didn't crash)");
});
</script>

5
Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
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@ -1721,7 +1721,7 @@ void HTMLParser::handle_in_body(HTMLToken& token)
// If it is not, add the attribute and its corresponding value to that element.
token.for_each_attribute([&](auto& attribute) {
if (!current_node().has_attribute(attribute.local_name))
MUST(current_node().set_attribute(attribute.local_name, attribute.value));
current_node().append_attribute(attribute.local_name, attribute.value);
return IterationDecision::Continue;
});
return;
@ -1743,7 +1743,6 @@ void HTMLParser::handle_in_body(HTMLToken& token)
// -> A start tag whose tag name is "body"
if (token.is_start_tag() && token.tag_name() == HTML::TagNames::body) {
// Parse error.
log_parse_error();
@ -1763,7 +1762,7 @@ void HTMLParser::handle_in_body(HTMLToken& token)
auto& body_element = m_stack_of_open_elements.elements().at(1);
token.for_each_attribute([&](auto& attribute) {
if (!body_element->has_attribute(attribute.local_name))
MUST(body_element->set_attribute(attribute.local_name, attribute.value));
body_element->append_attribute(attribute.local_name, attribute.value);
return IterationDecision::Continue;
});
return;