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Test Info: Warnings
- This test has a WPT meta file that expects 1 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /css/css-pseudo/highlight-cascade/highlight-cascade-parent-style-change.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Pseudo-Elements Test: highlight cascade: inheritance after a parent style change</title>
<meta name="assert" content="This test verifies that a highlight pseudo-element inherits from the current style of the corresponding highlight pseudo-element of its parent element, not from a previously resolved one.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#parent { font-size: 10px; }
#parent::selection { text-shadow: green 1em 0; }
</style>
<div id="parent"><span id="child">text</span></div>
<script>
test(() => {
const parent = document.getElementById("parent");
const child = document.getElementById("child");
const shadow = element => getComputedStyle(element, "::selection").textShadow;
// Resolves and caches the highlight styles of both, the child inheriting from the parent.
assert_equals(shadow(parent), "rgb(0, 128, 0) 10px 0px 0px", "parent");
assert_equals(shadow(child), "rgb(0, 128, 0) 10px 0px 0px", "child");
// The parent's own highlight text-shadow is in em, so this changes it, and the child inherits
// that computed value through the highlight chain.
parent.style.fontSize = "40px";
assert_equals(shadow(parent), "rgb(0, 128, 0) 40px 0px 0px", "parent after the change");
assert_equals(shadow(child), "rgb(0, 128, 0) 40px 0px 0px", "child after the change");
}, "A highlight pseudo-element inherits from the parent's new style, not its previous one");
</script>