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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
parent 25f8c26624
commit 4a3497e9cd
Notes: sideshowbarker 2024-07-17 03:03:15 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/4a3497e9cd
Pull-request: https://github.com/SerenityOS/serenity/pull/23992
7 changed files with 52 additions and 8 deletions
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21
Tests/LibWeb/Text/input/HTMLLinkElement-explicitly-enabled-alternative-stylesheets.html Normal file
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@@ -0,0 +1,21 @@
<!DOCTYPE html>
<script src="include.js"></script>
<link title="preferred" disabled rel="stylesheet" href="data:text/css,html { background: rgb(255, 0, 0) }">
<link title="alternative" disabled rel="alternate stylesheet" href="data:text/css,html { background: rgb(0, 128, 0) !important }">
<script>
asyncTest(done => {
const documentStyle = getComputedStyle(document.documentElement);
println(`background color initial value: ${documentStyle.backgroundColor}`);
const primaryLink = document.querySelector("link[title=preferred]");
const alternativeLink = document.querySelector("link[title=alternative]");
primaryLink.onload = () => {
println(`background color after preferred style sheet enabled: ${documentStyle.backgroundColor}`);
alternativeLink.disabled = false;
};
alternativeLink.onload = () => {
println(`background color after alternate style sheet enabled: ${documentStyle.backgroundColor}`);
done();
};
primaryLink.disabled = false;
});
</script>