HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>exitPictureInPicture await</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} video{max-width:100%;} button{margin-right:0.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <video id="player" width="360" controls src="https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4"></video>
  <p>
    <button id="enter" type="button">Enter PiP</button>
    <button id="exit" type="button">Exit PiP</button>
  </p>
  <pre id="out">Ready</pre>
  <script>
    var video = document.getElementById("player");
    var out = document.getElementById("out");
    async function leavePiP() {
      if (!document.pictureInPictureElement) {
        out.textContent = "not in picture-in-picture";
        return;
      }
      await document.exitPictureInPicture();
      out.textContent = "exited PiP";
    }
    document.getElementById("enter").addEventListener("click", function () {
      if (!document.pictureInPictureEnabled) {
        out.textContent = "PiP not enabled";
        return;
      }
      video.requestPictureInPicture().then(function () {
        out.textContent = "entered PiP";
      }).catch(function (err) {
        out.textContent = "enter failed: " + err.message;
      });
    });
    document.getElementById("exit").addEventListener("click", function () {
      leavePiP().catch(function (err) {
        out.textContent = String(err);
      });
    });
  </script>
</body>
</html>

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Document.exitPictureInPicture — guard + await (Try It)