File: simple-important-important.html

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<!DOCTYPE html>
<html>
  <head>
    <title>CSS Shadow Parts - Simple Important Important</title>
    <meta href="mailto:fergal@chromium.org" rel="author" title="Fergal Daly">
    <link href="http://www.google.com/" rel="author" title="Google">
    <link href="https://drafts.csswg.org/css-shadow-parts/" rel="help">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="support/shadow-helper.js"></script>
  </head>
  <body>
    <style>#c-e::part(partp) { color: green !important; }</style>
    <script>installCustomElement("custom-element", "custom-element-template");</script>
    <template id="custom-element-template">
      <style>span { color: red !important; }</style>
      <span id="part" part="partp">This text</span>
    </template>
    The following text should be green:
    <custom-element id="c-e"></custom-element>
    <script>
      "use strict";
      const colorRed = "rgb(255, 0, 0)";
      test(function() {
        const el = getElementByShadowIds(document, ["c-e", "part"]);
        assert_equals(window.getComputedStyle(el).color, colorRed);
      }, "Part in selected host is styled");
    </script>
  </body>
</html>