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LibWeb: Start implementing render-blocking mechanism from HTML spec

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This change implements enough spec steps to block rendering until
execution of sync scripts inserted from HTML parser is complete.
This commit is contained in:
Aliaksandr Kalenik 2025-02-04 19:09:14 +01:00 • committed by Andreas Kling
parent 75168fa4d6
commit da579e11b0
Notes: github-actions[bot] 2025-02-05 17:29:43 +00:00
7 changed files with 99 additions and 3 deletions
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15
Libraries/LibWeb/HTML/HTMLScriptElement.cpp
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@ -97,7 +97,8 @@ void HTMLScriptElement::execute_script()
return;
}
// FIXME: 3. Unblock rendering on el.
// 3. Unblock rendering on el.
unblock_rendering();
// 3. If el's result is null, then fire an event named error at el, and return.
if (m_result.has<ResultState::Null>()) {
@ -393,7 +394,10 @@ void HTMLScriptElement::prepare_script()
return;
}
// FIXME: 7. If el is potentially render-blocking, then block rendering on el.
// 7. If el is potentially render-blocking, then block rendering on el.
if (is_potentially_render_blocking()) {
block_rendering();
}
// 8. Set el's delaying the load event to true.
begin_delaying_document_load_event(*m_preparation_time_document);
@ -664,4 +668,11 @@ WebIDL::ExceptionOr<void> HTMLScriptElement::cloned(Node& copy, bool subtree) co
return {};
}
// https://html.spec.whatwg.org/multipage/urls-and-fetching.html#implicitly-potentially-render-blocking
bool HTMLScriptElement::is_implicitly_potentially_render_blocking() const
{
// A script element el is implicitly potentially render-blocking if el's type is "classic", el is parser-inserted, and el does not have an async or defer attribute.
return m_script_type == ScriptType::Classic && is_parser_inserted() && !has_attribute(AttributeNames::async) && !has_attribute(AttributeNames::defer);
}
}