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HTML

              
                <div class="container">
    <video controls
        src="https://archive.org/download/BigBuckBunny_124/Content/big_buck_bunny_720p_surround.mp4"
        poster="https://peach.blender.org/wp-content/uploads/title_anouncement.jpg?x11217">

    Sorry, your browser doesn't support embedded videos, 
    but don't worry, you can <a href="https://archive.org/details/BigBuckBunny_124">download it</a> 
    and watch it with your favorite video player!

    </video>
    <aside data-target="notice"></aside>
    <button data-target="enter-pip" type="button" class="pure-button pure-button-primary">Enter PIP</button>

    <button data-target="exit-pip" type="button" class="pure-button">Exit PIP</button>
  </div>
              
            
!

CSS

              
                body {
  padding: 30px;
}

.container {
  width: 50%;
}

video {
  display: block;
  margin-bottom: 20px;
  width: 100%;
}

[data-target="pip"] {
  display: inline-block;
}

aside {
  background: #1f8dd6;
  margin: 1em 0;
  padding: 0.3em 1em;
  border-radius: 3px;
  color: #fff;
}
              
            
!

JS

              
                const isSupportPictureInPictureEnabled = "pictureInPictureEnabled" in document;
const videoElement = document.querySelector("video");
const enterPipButton = document.querySelector('[data-target="enter-pip"]');
const exitPipButton = document.querySelector('[data-target="exit-pip"]');
const notice = document.querySelector('[data-target="notice"]');

checkPipIsSupported();

enterPipButton.addEventListener("click", e => {
  e.preventDefault();
  // 觸發影片進入 PIP 模式
  videoElement.requestPictureInPicture().catch(error => {
    // Error Handling
    console.log({
      name: error.name,
      message: error.message
    });
  });
});

exitPipButton.addEventListener("click", e => {
  e.preventDefault();
  // 影片離開 PIP 模式
  document.exitPictureInPicture().catch(error => {
    // Error Handling
    console.log({
      name: error.name,
      message: error.message
    });
  });
});

/**
 * 事件
 **/
videoElement.addEventListener("enterpictureinpicture", () => {
  notice.textContent = "Enter Picture-in-Picture mode";
});

videoElement.addEventListener("leavepictureinpicture", () => {
  notice.textContent = "Exit Picture-in-Picture mode";
});

/**
 * 在 PIP 的視窗上增加前一部、後一部的功能鍵
 **/
navigator.mediaSession.setActionHandler("previoustrack", () => {
  // Go to previous track
});

navigator.mediaSession.setActionHandler("nexttrack", () => {
  // Go to next track
});

/**
 * 如果瀏覽器不支援 PIP
 **/
function checkPipIsSupported() {
  if (!isSupportPictureInPictureEnabled) {
    notice.textContent = "Picture In Picture is not supported.";

    enterPipButton.classList.add("hidden");
    enterPipButton.disabled = true;

    exitPipButton.classList.add("hidden");
    exitPipButton.disabled = true;
  } else {
    notice.textContent = "Picture In Picture is supported.";
  }
}

              
            
!
999px

Console