Blitz - WPT: media-playback-state.html

wpt / css / selectors / media / media-playback-state.html

Data from commit:
1884860 Copy-on-write style attribute blocks that are in the rule tree (#831) (2026-09-02)

Subtest	Status	Message
Test :pseudo-class syntax is supported without throwing a SyntaxError	FAIL	assert_unreached: :playing is not supported Reached unreachable code
Test :playing pseudo-class	FAIL	assert_implements: :playing is not supported undefined
Test :paused pseudo-class	FAIL	assert_implements: :paused is not supported undefined
Test :seeking pseudo-class	FAIL	assert_implements: :seeking is not supported undefined
Test that non-media elements do not match :playing, :paused, or :seeking	FAIL	assert_implements: :playing is not supported undefined

Enable JavaScript in test iframe

/css/selectors/media/media-playback-state.html

<!DOCTYPE html>
<title>
  Media Playback State: the :playing, :paused, and :seeking 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>
<body>
  <video width="300" height="300" muted loop></video>
  <script>
    test((t) => {
      for (const pseudo of [":playing", ":paused", ":seeking"]) {
        try {
          document.querySelector(`.not-a-thing${pseudo}`);
        } catch (e) {
          assert_unreached(`${pseudo} is not supported`);
        }
      }
    }, "Test :pseudo-class syntax is supported without throwing a SyntaxError");

    promise_test(async (t) => {
      assert_implements(CSS.supports("selector(:playing)"), ":playing is not supported");
      const video = document.querySelector("video");
      await new Promise((r) => {
        video.addEventListener("canplay", r, { once: true });
        video.src = getVideoURI("/media/counting");
      });
      video.muted = true; // allows us to play the video
      assert_true(video.muted, "video is muted");
      assert_true(video.paused, "video is paused");
      await new Promise((r) => {
        video.addEventListener("playing", r, { once: true });
        video.play();
      });
      assert_false(video.paused, "video is playing");
      assert_equals(document.querySelector("video:playing"), video);
      assert_equals(document.querySelector("video:not(:playing)"), null);
      assert_equals(document.querySelector("video:paused"), null);
      assert_equals(document.querySelector("video:not(:paused)"), video);
    }, "Test :playing pseudo-class");

    promise_test(async (t) => {
      assert_implements(CSS.supports("selector(:paused)"), ":paused is not supported");
      const video = document.querySelector("video");
      await new Promise((r) => {
        video.addEventListener("canplay", r, { once: true });
        video.src = getVideoURI("/media/counting");
      });
      assert_equals(video.paused, true);
      assert_equals(document.querySelector("video:playing"), null);
      assert_equals(document.querySelector("video:not(:playing)"), video);
      assert_equals(document.querySelector("video:paused"), video);
      assert_equals(document.querySelector("video:not(:paused)"), null);
    }, "Test :paused pseudo-class");

    promise_test(async (t) => {
      assert_implements(CSS.supports("selector(:seeking)"), ":seeking is not supported");
      const video = document.querySelector("video");
      await new Promise((r) => {
        video.addEventListener("canplay", r, { once: true });
        video.src = getVideoURI("/media/counting");
      });
      assert_equals(document.querySelector("video:seeking"), null);
      assert_equals(document.querySelector("video:not(:seeking)"), video);
      await new Promise((r) => {
        video.addEventListener("seeking", r, { once: true });
        video.currentTime = 10;
      });
      assert_equals(document.querySelector("video:seeking"), video);
      assert_equals(document.querySelector("video:not(:seeking)"), null);
    }, "Test :seeking pseudo-class");

    test((t) => {
      const pseudoClasses = [":playing", ":paused", ":seeking"];
      const div = document.createElement("div");
      document.body.appendChild(div);
      t.add_cleanup(() => div.remove());
      for (const pseudo of pseudoClasses) {
        assert_implements(CSS.supports(`selector(${pseudo})`), `${pseudo} is not supported`);
        assert_false(div.matches(pseudo));
        assert_true(div.matches(`:not(${pseudo})`));
      }
     }, "Test that non-media elements do not match :playing, :paused, or :seeking");
  </script>
</body>