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LibWeb: Append style sheet to ShadowRoot's list if link el is in one
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Browse source 
We were handling removing the style sheet from the shadow root, but not
appending to it. Fixing this also revealed a bug that a removed link
element would always try to remove from the document's list, as the
root is no longer the shadow root it's in. The fix is to use the passed
in old root to remove the style sheet from.

Fixes the cookie banner on https://nos.nl/
This commit is contained in:
Luke Wilde 2025-04-02 16:53:26 +01:00 • committed by Alexander Kalenik
parent 14bac7b287
commit cd72e788e9
Notes: github-actions[bot] 2025-04-08 21:22:01 +00:00
3 changed files with 62 additions and 2 deletions
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11
Libraries/LibWeb/HTML/HTMLLinkElement.cpp
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@ -56,7 +56,14 @@ void HTMLLinkElement::removed_from(Node* old_parent, Node& old_root)
{
Base::removed_from(old_parent, old_root);
if (m_loaded_style_sheet) {
document_or_shadow_root_style_sheets().remove_a_css_style_sheet(*m_loaded_style_sheet);
auto& style_sheet_list = [&old_root] -> CSS::StyleSheetList& {
if (auto* shadow_root = as_if<DOM::ShadowRoot>(old_root); shadow_root)
return shadow_root->style_sheets();
return as<DOM::Document>(old_root).style_sheets();
}();
style_sheet_list.remove_a_css_style_sheet(*m_loaded_style_sheet);
m_loaded_style_sheet = nullptr;
}
}
@ -487,7 +494,7 @@ void HTMLLinkElement::process_stylesheet_resource(bool success, Fetch::Infrastru
if (!response.url_list().is_empty())
location = response.url_list().first().to_string();
document().style_sheets().create_a_css_style_sheet(
document_or_shadow_root_style_sheets().create_a_css_style_sheet(
"text/css"_string,
this,
attribute(HTML::AttributeNames::media).value_or({}),