no-autoplay-audio-history-back-does-not-play.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/media-elements/no-autoplay-audio-history-back-does-not-play.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>No autoplay audio does not start after history back</title>

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

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

<body>

  <script>

    "use strict";

    promise_test(async t => {

      const base = location.pathname.replace(/[^/]*$/, "");

      const iframe = document.createElement("iframe");

      document.body.appendChild(iframe);

      t.add_cleanup(() => iframe.remove());

      function waitForMessage(type, timeoutMs) {

        let timeoutId;

        let onMessage;

        const timeoutPromise = new Promise((_, reject) => {

          timeoutId = t.step_timeout(() => {

            window.removeEventListener("message", onMessage);

            reject(new Error(`Timed out waiting for ${type}`));

          }, timeoutMs);

});

        const messagePromise = new Promise((resolve) => {

          onMessage = (event) => {

            if (event.source !== iframe.contentWindow) return;

            if (!event.data || event.data.type !== type) return;

            clearTimeout(timeoutId);

            window.removeEventListener("message", onMessage);

            resolve(event.data);

};

          window.addEventListener("message", onMessage);

});

        return Promise.race([timeoutPromise, messagePromise]);

      iframe.src = `${base}resources/no-autoplay-audio-history-back-does-not-play-a.html`;

      await waitForMessage("ready_a", 3000);

      iframe.src = `${base}resources/no-autoplay-audio-history-back-does-not-play-b.html`;

      await waitForMessage("loaded_b", 3000);

      iframe.contentWindow.history.back();

      const result = await waitForMessage("result", 3000);

      assert_true(result.pass, JSON.stringify(result.details));

    }, "No autoplay audio remains paused after iframe history back");

  </script>

</body>