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LibWeb: Support loading alternative style sheets

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Alternative style sheets are now fetched and are applied to the
document if they are explicitly enabled by removing the disabled
attribute.
This commit is contained in:
Tim Ledbetter 2024-04-16 21:02:50 +01:00 • committed by Andreas Kling
commit 4a3497e9cd
Notes: sideshowbarker 2024-07-17 03:03:15 +09:00
7 changed files with 52 additions and 8 deletions
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13
Userland/Libraries/LibWeb/HTML/HTMLLinkElement.cpp
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@ -50,8 +50,7 @@ void HTMLLinkElement::inserted()
{
HTMLElement::inserted();
// FIXME: Handle alternate stylesheets properly
if (m_relationship & Relationship::Stylesheet && !(m_relationship & Relationship::Alternate)) {
if (m_relationship & Relationship::Stylesheet) {
// https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet:fetch-and-process-the-linked-resource
// The appropriate times to fetch and process this type of link are:
// - When the external resource link is created on a link element that is already browsing-context connected.
@ -110,8 +109,12 @@ void HTMLLinkElement::attribute_changed(FlyString const& name, Optional<String>
}
}
// FIXME: Handle alternate stylesheets properly
if (m_relationship & Relationship::Stylesheet && !(m_relationship & Relationship::Alternate)) {
// https://html.spec.whatwg.org/multipage/semantics.html#the-link-element:explicitly-enabled
// Whenever the disabled attribute is removed, set the link element's explicitly enabled attribute to true.
if (!value.has_value() && name == HTML::AttributeNames::disabled)
m_explicitly_enabled = true;
if (m_relationship & Relationship::Stylesheet) {
if (name == HTML::AttributeNames::disabled && m_loaded_style_sheet)
document_or_shadow_root_style_sheets().remove_a_css_style_sheet(*m_loaded_style_sheet);
@ -374,7 +377,7 @@ void HTMLLinkElement::process_stylesheet_resource(bool success, Fetch::Infrastru
this,
attribute(HTML::AttributeNames::media).value_or({}),
in_a_document_tree() ? attribute(HTML::AttributeNames::title).value_or({}) : String {},
false,
m_relationship & Relationship::Alternate && !m_explicitly_enabled,
true,
{},
nullptr,