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Bug 1865610: part 1) Add partial support for the "fetchpriority" attribute for loading style sheets from <link> elements or Link header fields. r=smaug,emilio,valentin

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Includes only support for dynamically loading style sheets from `<link>`
elements and `Link` header fields.
The remaining support, including preloading, is completed in part 3.

Differential Revision: https://phabricator.services.mozilla.com/D191745
This commit is contained in:
Mirko Brodesser
2023-11-23 14:36:11 +00:00
parent 831884f9bb
commit 2a72b3ab97
24 changed files with 348 additions and 68 deletions
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40
dom/script/ScriptLoader.cpp
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@@ -682,26 +682,28 @@ static void AdjustPriorityForNonLinkPreloadScripts(
// For web-compatibility, the fetch priority mapping from
// <https://web.dev/fetch-priority/#browser-priority-and-fetchpriority> is
// taken.
switch (fetchPriority) {
case RequestPriority::Auto:
LOG(("ScriptLoader::%s:, fetchpriority=auto", __FUNCTION__));
break;
case RequestPriority::Low: {
LOG(("ScriptLoader::%s:, fetchpriority=low, setting priority",
__FUNCTION__));
supportsPriority->SetPriority(nsISupportsPriority::PRIORITY_LOW);
break;
}
case RequestPriority::High: {
LOG(("ScriptLoader::%s:, fetchpriority=high, setting priority",
__FUNCTION__));
supportsPriority->SetPriority(nsISupportsPriority::PRIORITY_HIGH);
break;
}
default: {
MOZ_ASSERT_UNREACHABLE();
break;
const Maybe<int32_t> supportsPriorityValue = [&]() -> Maybe<int32_t> {
switch (fetchPriority) {
case RequestPriority::Auto:
return Nothing{};
case RequestPriority::Low: {
return Some(nsISupportsPriority::PRIORITY_LOW);
}
case RequestPriority::High: {
return Some(nsISupportsPriority::PRIORITY_HIGH);
}
default: {
MOZ_ASSERT_UNREACHABLE();
return Nothing{};
}
}
}();
if (supportsPriorityValue) {
LogPriorityMapping(ScriptLoader::gScriptLoaderLog,
ToFetchPriority(fetchPriority),
*supportsPriorityValue);
supportsPriority->SetPriority(*supportsPriorityValue);
}
}
}