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LibWeb: Assume XHTML <html> elements are in the HTML namespace

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...unless specified otherwise explicitly.
This is dervied from an interpretation of a note in the html5 spec at
https://html.spec.whatwg.org/#xml
This commit is contained in:
Ali Mohammad Pur 2024-10-12 21:58:39 +02:00 committed by Andreas Kling
parent b86f0747dc
commit 5c23ef1596
Notes: github-actions[bot] 2024-10-12 21:01:09 +00:00 
Author: https://github.com/alimpfard
Commit: https://github.com/LadybirdBrowser/ladybird/commit/5c23ef1596b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1751
1 changed files with 11 additions and 2 deletions
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13
Userland/Libraries/LibWeb/XML/XMLDocumentBuilder.cpp
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@ -57,7 +57,9 @@ void XMLDocumentBuilder::element_start(const XML::Name& name, HashMap<XML::Name,
if (m_has_error)
return;
auto found_explicit_namespace = false;
if (auto it = attributes.find("xmlns"); it != attributes.end()) {
found_explicit_namespace = true;
m_namespace_stack.append({ m_namespace, 1 });
m_namespace = MUST(FlyString::from_deprecated_fly_string(it->value));
} else {
@ -65,8 +67,15 @@ void XMLDocumentBuilder::element_start(const XML::Name& name, HashMap<XML::Name,
}
if (name == HTML::TagNames::html.to_deprecated_fly_string() && m_namespace != Namespace::HTML) {
m_has_error = true;
return;
// HTML / 2.1.3 XML compatibility: https://html.spec.whatwg.org/#xml
// To ease migration from HTML to XML, user agents conforming to this specification will place elements in HTML
// in the http://www.w3.org/1999/xhtml namespace, at least for the purposes of the DOM and CSS.
// The term "HTML elements" refers to any element in that namespace, even in XML documents.
if (found_explicit_namespace || m_namespace_stack.size() != 1 || m_namespace_stack.last().depth != 2) {
m_has_error = true;
return;
}
m_namespace = Namespace::HTML;
}
auto node = DOM::create_element(m_document, MUST(FlyString::from_deprecated_fly_string(name)), m_namespace).release_value_but_fixme_should_propagate_errors();