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LibWeb: Allow custom properties on pseudo-elements with property lists

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This commit is contained in:
Tim Ledbetter
2026-03-04 11:20:51 +00:00
committed by Jelle Raaijmakers
parent fb61294df7
commit e49b643f86
Notes: github-actions[bot] 2026-03-04 12:38:07 +00:00 
Author: https://github.com/tcl3
Commit: https://github.com/LadybirdBrowser/ladybird/commit/e49b643f868
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8267
Reviewed-by: https://github.com/gmta ✅
7 changed files with 251 additions and 1 deletions
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Tests/LibWeb/Text/input/wpt-import/css/css-variables/variable-first-letter.html Normal file
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<!DOCTYPE html>
<html>
<head>
<title>CSS Variables with ::first-letter pseudo-element.</title>
<meta rel="author" title="Kevin Babbitt">
<meta rel="author" title="Greg Whitworth">
<link rel="author" title="Microsoft Corporation" href="http://microsoft.com" />
<!-- This is not directly specified in the spec but should work -->
<link rel="help" href="http://www.w3.org/TR/css-variables-1/#defining-variables">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style>
#div1::first-letter {
color: var(--my-color);
--my-color: rgb(0, 0, 255);
}
#div2::first-letter {
font-size: var(--my-font-size);
--my-font-size: 25px;
}
#div3::first-letter {
font-weight: var(--my-font-weight);
--my-font-weight: 900;
}
#div4::first-letter {
position: var(--my-position);
--my-position: absolute;
}
#div5::first-letter {
color: var(--my-color1);
--my-color1: var(--my-color2);
--my-color2: rgb(0, 0, 255);
}
#div6::first-letter {
position: var(--my-position1);
--my-position1: var(--my-position2);
--my-position2: absolute;
}
</style>
</head>
<body>
<div id="div1">CSS variable defining 'color' property should be applied to ::first-letter and its color should be blue.</div>
<div id="div2">CSS variable defining 'font-size' property should be applied to ::first-letter and its font-size should be 25px.</div>
<div id="div3">CSS variable defining 'font-weight' property should be applied to ::first-letter and its font-weight should be 900.</div>
<div id="div4">CSS variable defining 'position' property should not be applied to ::first-letter and its position should be static.</div>
<div id="div5">CSS variable referencing another CSS variable that defines 'color' property should be applied to ::first-letter and its color should be blue.</div>
<div id="div6">CSS variable referencing another CSS variable that defines 'position' property should not be applied to ::first-letter and its position should be static.</div>
<script>
"use strict";
var testcases = [
{ elementId: "div1", property: "color", expectedValue: "rgb(0, 0, 255)", testName: "color" },
{ elementId: "div2", property: "font-size", expectedValue: "25px", testName: "font-size" },
{ elementId: "div3", property: "font-weight", expectedValue: "900", testName: "font-weight" },
{ elementId: "div4", property: "position", expectedValue: "static", testName: "position" },
{ elementId: "div5", property: "color", expectedValue: "rgb(0, 0, 255)", testName: "nested color" },
{ elementId: "div6", property: "position", expectedValue: "static", testName: "abspos" },
];
testcases.forEach(function (tc) {
test( function () {
var elem = document.getElementById(tc.elementId);
var actualValue = window.getComputedStyle(elem, ':first-letter').getPropertyValue(tc.property);
assert_equals(tc.expectedValue, actualValue);
}, tc.testName);
});
</script>
</body>
</html>