wpt/css/selectors/media/media-playing-paused-style-invalidation.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>CSS style invalidation for :playing and :paused pseudo-classes</title>
<link rel="help" href="https://drafts.csswg.org/selectors/#video-state">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/media.js"></script>
<style>
  #playing-only:playing { outline-color: green; }
  #paused-only:paused { outline-color: orange; }
  #both:playing { outline-color: green; }
  #both:paused { outline-color: orange; }
</style>
<body>
  <video id="playing-only" width="300" height="300" muted loop></video>
  <video id="paused-only" width="300" height="300" muted loop></video>
  <video id="both" width="300" height="300" muted loop></video>
  <script>
    const BLACK = "rgb(0, 0, 0)";
    const GREEN = "rgb(0, 128, 0)";
    const ORANGE = "rgb(255, 165, 0)";

    promise_test(async (t) => {
      assert_implements(CSS.supports("selector(:playing)"), ":playing is not supported");
      const video = document.querySelector("#playing-only");
      t.add_cleanup(() => { video.pause(); video.removeAttribute("src"); });
      await new Promise((r) => {
        video.addEventListener("canplay", r, { once: true });
        video.src = getVideoURI("/media/counting");
      });
      assert_equals(getComputedStyle(video).outlineColor, BLACK,
                    ":playing rule must not apply while paused");
      await video.play();
      assert_equals(getComputedStyle(video).outlineColor, GREEN,
                    ":playing rule must apply after play()");
    }, "CSS invalidation fires for :playing when no :paused rule is present");

    promise_test(async (t) => {
      assert_implements(CSS.supports("selector(:paused)"), ":paused is not supported");
      const video = document.querySelector("#paused-only");
      t.add_cleanup(() => { video.pause(); video.removeAttribute("src"); });
      await new Promise((r) => {
        video.addEventListener("canplay", r, { once: true });
        video.src = getVideoURI("/media/counting");
      });
      assert_equals(getComputedStyle(video).outlineColor, ORANGE,
                    ":paused rule must apply while paused");
      await video.play();
      assert_equals(getComputedStyle(video).outlineColor, BLACK,
                    ":paused rule must not apply after play()");
    }, "CSS invalidation fires for :paused when no :playing rule is present");

    promise_test(async (t) => {
      assert_implements(CSS.supports("selector(:playing)") && CSS.supports("selector(:paused)"),
                        ":playing or :paused is not supported");
      const video = document.querySelector("#both");
      t.add_cleanup(() => { video.pause(); video.removeAttribute("src"); });
      await new Promise((r) => {
        video.addEventListener("canplay", r, { once: true });
        video.src = getVideoURI("/media/counting");
      });
      assert_equals(getComputedStyle(video).outlineColor, ORANGE,
                    ":paused rule must apply while paused");
      await video.play();
      assert_equals(getComputedStyle(video).outlineColor, GREEN,
                    ":playing rule must apply after play()");
      video.pause();
      assert_equals(getComputedStyle(video).outlineColor, ORANGE,
                    ":paused rule must apply after pause()");
    }, "CSS invalidation fires for both :playing and :paused rules");
  </script>
</body>