part-mutation-pseudo.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-shadow-parts/part-mutation-pseudo.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>CSS Shadow Parts - Invalidation Change Part Name on pseudo</title>

<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/">

<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">

<link rel="author" href="https://mozilla.org" title="Mozilla">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="support/shadow-helper.js"></script>

<style>#c-e::part(partp)::before { color: red; }</style>

<script>installCustomElement("custom-element", "custom-element-template");</script>

<template id="custom-element-template">

  <style>span::before { content: ""; color: green; }</style>

  <span id="part" part="partp">This text</span>

</template>

The following text should be green:

<div><custom-element id="c-e"></custom-element></div>

<script>

  "use strict";

  test(function() {

    const part = getElementByShadowIds(document, ["c-e", "part"]);

    const before = getComputedStyle(part, "::before").color;

    part.setAttribute("part", "somethingelse");

    const after = getComputedStyle(part, "::before").color;

    assert_not_equals(before, after);

  }, "Part in selected host changed color");

</script>