tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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host-part-001.html (1327B)

      1 <!doctype html>
      2 <title>CSS Shadow Parts - :host::part()</title>
      3 <link rel="author" title="Mozilla" href="https://mozilla.org">
      4 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
      5 <link rel="help" href="https://drafts.csswg.org/css-shadow-parts/#part">
      6 <link rel="help" href="https://drafts.csswg.org/css-scoping/#host-selector">
      7 <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1624968">
      8 <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=980506">
      9 <script src="/resources/testharness.js"></script>
     10 <script src="/resources/testharnessreport.js"></script>
     11 <div id="host"></div>
     12 <script>
     13 test(function() {
     14  let host = document.getElementById("host");
     15  host.attachShadow({ mode: "open" }).innerHTML = `
     16    <style>
     17      :host::part(mypart) {
     18        color: lime;
     19      }
     20      :host(.tweak)::part(mypart) {
     21        color: blue;
     22      }
     23    </style>
     24    <div part="mypart"></div>
     25  `;
     26 
     27  let part = host.shadowRoot.querySelector("[part]");
     28 
     29  assert_equals(
     30    window.getComputedStyle(part).color,
     31    "rgb(0, 255, 0)",
     32    ":host::part() works",
     33  );
     34 
     35  host.classList.add("tweak");
     36 
     37  assert_equals(
     38    window.getComputedStyle(part).color,
     39    "rgb(0, 0, 255)",
     40    ":host::part() invalidation works properly",
     41  );
     42 }, ":host::part works");
     43 </script>