### Access and Create Document Picture-in-Picture Window

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Check if a PiP window is currently open using `documentPictureInPicture.window`. If no window exists, `requestWindow()` can be called to create a new one. This snippet demonstrates how to get an existing window or create a new one and then populate its body.

```javascript
// Check if a PiP window is currently open
function isPiPWindowOpen() {
  return documentPictureInPicture.window !== null;
}

// Get the current PiP window or open a new one
async function getOrCreatePiPWindow() {
  // Check if there's already an open PiP window
  const existingWindow = documentPictureInPicture.window;

  if (existingWindow) {
    console.log('Using existing PiP window');
    return existingWindow;
  }

  // No existing window, create a new one
  console.log('Creating new PiP window');
  return await documentPictureInPicture.requestWindow({
    width: 320,
    height: 240
  });
}

// Example usage
document.querySelector('#pip-button').addEventListener('click', async () => {
  const pipWindow = await getOrCreatePiPWindow();
  pipWindow.document.body.innerHTML = '<h1>Hello PiP!</h1>';
});
```

--------------------------------

### Configure and Open Document Picture-in-Picture Windows

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Demonstrates various configurations for the requestWindow method, including setting dimensions, controlling the return-to-opener UI, and managing window placement.

```javascript
// All available options for requestWindow()
async function openConfiguredPiPWindow() {
  const options = {
    // Initial width of the PiP window viewport (in pixels)
    // Must be specified together with height, or both must be 0/omitted
    width: 400,

    // Initial height of the PiP window viewport (in pixels)
    height: 300,

    // When true, hints to the UA to hide the "return to tab" button
    // Useful for experiences where returning doesn't make sense
    disallowReturnToOpener: false,

    // When true, hints to the UA to use default position/size
    // instead of remembering previous PiP window position
    preferInitialWindowPlacement: false
  };

  const pipWindow = await documentPictureInPicture.requestWindow(options);

  // Window inherits the opener's document mode (quirks/standards)
  console.log('Document mode:', pipWindow.document.compatMode);

  return pipWindow;
}

// Open with return-to-opener disabled (e.g., for standalone widgets)
async function openStandaloneTimer() {
  const pipWindow = await documentPictureInPicture.requestWindow({
    width: 200,
    height: 100,
    disallowReturnToOpener: true // Hide "back to tab" UI
  });

  pipWindow.document.body.innerHTML = `
    <div style="font-size: 48px; text-align: center; padding: 20px;">
      25:00
    </div>
  `;

  return pipWindow;
}

// Open with fresh positioning (ignore previous position)
async function openFreshPiPWindow() {
  const pipWindow = await documentPictureInPicture.requestWindow({
    width: 320,
    height: 240,
    preferInitialWindowPlacement: true // Don't remember last position
  });

  return pipWindow;
}
```

--------------------------------

### Implement Video Conferencing in PiP

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Creates a custom PiP window containing a video grid for remote streams, a local video preview, and interactive controls for muting and camera toggling. Requires an active local stream and a list of remote streams.

```javascript
// Multi-stream video conferencing in PiP
async function enterVideoConferencePiP(localStream, remoteStreams) {
  const pipWindow = await documentPictureInPicture.requestWindow({
    width: 480,
    height: 360
  });

  // Add styles
  const style = pipWindow.document.createElement('style');
  style.textContent = `
    body { margin: 0; background: #1a1a1a; }
    .video-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 4px;
      height: calc(100% - 50px);
    }
    video { width: 100%; height: 100%; object-fit: cover; }
    .local-video {
      position: absolute; bottom: 60px; right: 10px;
      width: 120px; border: 2px solid #fff; border-radius: 8px;
    }
    .controls {
      position: fixed; bottom: 0; width: 100%;
      display: flex; justify-content: center; gap: 10px;
      padding: 10px; background: #2a2a2a;
    }
    .controls button {
      padding: 10px 20px; border-radius: 20px;
      border: none; cursor: pointer;
    }
    .mute-btn.muted { background: #ff4444; color: white; }
  `;
  pipWindow.document.head.appendChild(style);

  // Create video grid for remote participants
  const videoGrid = pipWindow.document.createElement('div');
  videoGrid.className = 'video-grid';

  remoteStreams.forEach((stream, index) => {
    const video = pipWindow.document.createElement('video');
    video.srcObject = stream;
    video.autoplay = true;
    video.playsInline = true;
    videoGrid.appendChild(video);
  });

  pipWindow.document.body.appendChild(videoGrid);

  // Local video preview (picture-in-picture within PiP)
  const localVideo = pipWindow.document.createElement('video');
  localVideo.className = 'local-video';
  localVideo.srcObject = localStream;
  localVideo.autoplay = true;
  localVideo.muted = true; // Prevent feedback
  localVideo.playsInline = true;
  pipWindow.document.body.appendChild(localVideo);

  // Control bar
  const controls = pipWindow.document.createElement('div');
  controls.className = 'controls';

  // Mute button
  const muteBtn = pipWindow.document.createElement('button');
  muteBtn.className = 'mute-btn';
  muteBtn.textContent = '🎤 Mute';
  muteBtn.addEventListener('click', () => {
    const audioTrack = localStream.getAudioTracks()[0];
    audioTrack.enabled = !audioTrack.enabled;
    muteBtn.classList.toggle('muted', !audioTrack.enabled);
    muteBtn.textContent = audioTrack.enabled ? '🎤 Mute' : '🔇 Unmute';
  });

  // Camera toggle
  const cameraBtn = pipWindow.document.createElement('button');
  cameraBtn.textContent = '📹 Camera';
  cameraBtn.addEventListener('click', () => {
    const videoTrack = localStream.getVideoTracks()[0];
    videoTrack.enabled = !videoTrack.enabled;
    cameraBtn.textContent = videoTrack.enabled ? '📹 Camera' : '📷 Camera Off';
  });

  // Leave call
  const leaveBtn = pipWindow.document.createElement('button');
  leaveBtn.textContent = '📞 Leave';
  leaveBtn.style.background = '#ff4444';
  leaveBtn.style.color = 'white';
  leaveBtn.addEventListener('click', () => {
    window.focus();
    pipWindow.close();
    // Trigger leave call logic in main app
    window.dispatchEvent(new CustomEvent('leave-call'));
  });

  controls.append(muteBtn, cameraBtn, leaveBtn);
  pipWindow.document.body.appendChild(controls);

  return pipWindow;
}
```

--------------------------------

### Move elements to and from PiP window

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Demonstrates moving a video player element into a PiP window and returning it to the main document upon window closure.

```javascript
// Complete example: Custom video player with PiP
let pipWindow = null;

async function enterVideoPlayerPiP() {
  const player = document.querySelector('#player');
  const playerContainer = document.querySelector('#player-container');

  // Open PiP window sized to the player
  pipWindow = await documentPictureInPicture.requestWindow({
    width: player.clientWidth,
    height: player.clientHeight
  });

  // Copy styles to PiP window
  const style = pipWindow.document.createElement('style');
  style.textContent = `
    body { margin: 0; overflow: hidden; }
    #player { width: 100%; height: 100%; }
    video { width: 100%; height: 100%; object-fit: contain; }
    .controls {
      position: absolute; bottom: 0; width: 100%;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      padding: 10px; box-sizing: border-box;
    }
  `;
  pipWindow.document.head.appendChild(style);

  // Move the player element to PiP window
  pipWindow.document.body.appendChild(player);

  // Add visual indicator in main page
  playerContainer.classList.add('pip-mode');
  playerContainer.innerHTML = '<p>Player is in Picture-in-Picture mode</p>';

  // Handle PiP window closing
  pipWindow.addEventListener('pagehide', () => {
    // Move player back to main document
    const pipPlayer = pipWindow.document.querySelector('#player');
    playerContainer.classList.remove('pip-mode');
    playerContainer.innerHTML = '';
    playerContainer.appendChild(pipPlayer);
    pipWindow = null;
  }, { once: true });
}

// HTML structure expected:
// <div id="player-container">
//   <div id="player">
//     <video src="video.mp4"></video>
//     <div class="controls">...</div>
//   </div>
// </div>
```

--------------------------------

### Open a Document Picture-in-Picture Window

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Use `documentPictureInPicture.requestWindow()` to open a new PiP window with specified dimensions. This method requires a user gesture and returns a Promise resolving to the new Window object. It handles copying stylesheets and includes error handling for unsupported features or disallowed operations.

```javascript
async function openPictureInPicture() {
  try {
    // Request a PiP window with specified width and height
    const pipWindow = await documentPictureInPicture.requestWindow({
      width: 400,
      height: 300,
      disallowReturnToOpener: false,
      preferInitialWindowPlacement: false
    });

    // The pipWindow is a regular Window object with an empty document
    console.log('PiP window opened:', pipWindow);
    console.log('Document URL:', pipWindow.document.URL); // "about:blank"

    // Copy stylesheets from the main document to the PiP window
    [...document.styleSheets].forEach((styleSheet) => {
      try {
        const cssRules = [...styleSheet.cssRules].map((rule) => rule.cssText).join('');
        const style = document.createElement('style');
        style.textContent = cssRules;
        pipWindow.document.head.appendChild(style);
      } catch (e) {
        const link = document.createElement('link');
        link.rel = 'stylesheet';
        link.href = styleSheet.href;
        pipWindow.document.head.appendChild(link);
      }
    });

    return pipWindow;
  } catch (error) {
    // Handle errors: NotSupportedError, NotAllowedError, or RangeError
    if (error.name === 'NotSupportedError') {
      console.error('Document PiP is not supported');
    } else if (error.name === 'NotAllowedError') {
      console.error('Requires user gesture or top-level context');
    } else if (error.name === 'RangeError') {
      console.error('Width and height must both be specified or both be zero');
    }
    throw error;
  }
}
```

--------------------------------

### documentPictureInPicture.requestWindow()

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Opens a new picture-in-picture window with a blank document. Requires a user gesture to execute.

```APIDOC
## documentPictureInPicture.requestWindow()

### Description
Opens a new picture-in-picture window with a blank document that can be populated with arbitrary HTML elements. This method requires a user gesture to call.

### Parameters
#### Request Body
- **width** (number) - Optional - The width of the PiP window.
- **height** (number) - Optional - The height of the PiP window.
- **disallowReturnToOpener** (boolean) - Optional - Whether to prevent the return-to-opener button.
- **preferInitialWindowPlacement** (boolean) - Optional - Whether to prefer initial window placement.

### Response
#### Success Response (Promise)
- **Window** (object) - Resolves to the new Window object representing the PiP window.

### Errors
- **NotSupportedError** - Document PiP is not supported.
- **NotAllowedError** - Requires user gesture or top-level context.
- **RangeError** - Width and height must both be specified or both be zero.
```

--------------------------------

### Enter Picture-in-Picture Mode

Source: https://github.com/wicg/document-picture-in-picture/blob/main/README.md

Initiates Picture-in-Picture mode for a video player. Requires the video element to be present in the DOM. Styles the container to indicate PiP mode and appends the player to the PiP window.

```javascript
let pipWindow = null;

async function enterPiP() {
  const player = document.querySelector("#player");

  const pipOptions = {
    width: player.clientWidth,
    height: player.clientHeight,
  };

  pipWindow = await documentPictureInPicture.requestWindow(pipOptions);

  // Style remaining container to imply the player is in PiP.
  const playerContainer = document.querySelector("#player-container");
  playerContainer.classList.add("pip-mode");

  // Add player to the PiP window.
  pipWindow.document.body.append(player);

  // Listen for the PiP closing event to put the video back.
  pipWindow.addEventListener("pagehide", onLeavePiP.bind(pipWindow), {
    once: true,
  });
}
```

--------------------------------

### Handle PiP window creation events

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Use the 'enter' event or 'onenter' property to detect when a PiP window is opened and access the window object.

```javascript
// Listen for PiP window creation
documentPictureInPicture.addEventListener('enter', (event) => {
  const pipWindow = event.window;

  console.log('PiP window opened with dimensions:',
    pipWindow.innerWidth, 'x', pipWindow.innerHeight);

  // Set up the PiP window content
  pipWindow.document.body.style.margin = '0';
  pipWindow.document.body.style.backgroundColor = '#1a1a1a';
  pipWindow.document.body.style.color = 'white';

  // Add a close button to the PiP window
  const closeButton = pipWindow.document.createElement('button');
  closeButton.textContent = 'Close PiP';
  closeButton.style.cssText = 'position: fixed; top: 10px; right: 10px;';
  closeButton.addEventListener('click', () => pipWindow.close());
  pipWindow.document.body.appendChild(closeButton);
});

// Alternative: using onenter property
documentPictureInPicture.onenter = (event) => {
  console.log('PiP window ready:', event.window);
};
```

--------------------------------

### Define HTML structure for PiP

Source: https://github.com/wicg/document-picture-in-picture/blob/main/README.md

Provides the basic markup for a video player container and a trigger button to initiate the Picture-in-Picture experience.

```html
<body>
  <div id="player-container">
    <div id="player">
      <video id="video" src="foo.webm"></video>
      <!-- More player elements here. -->
    </div>
  </div>
  <input type="button" onclick="enterPiP();" value="Enter PiP" />
</body>
```

--------------------------------

### Manage PiP Window Lifecycle with PiPManager

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

This class handles opening, closing, and restoring elements from a Picture-in-Picture window. It tracks moved elements and ensures proper cleanup.

```javascript
// Complete lifecycle management for PiP windows
class PiPManager {
  constructor() {
    this.pipWindow = null;
    this.movedElements = new Map(); // Track moved elements and their origins
  }

  async open(options = {}) {
    // Close existing PiP window if open
    if (this.pipWindow && !this.pipWindow.closed) {
      this.pipWindow.close();
    }

    this.pipWindow = await documentPictureInPicture.requestWindow({
      width: options.width || 400,
      height: options.height || 300,
      ...options
    });

    // Set up close handler
    this.pipWindow.addEventListener('pagehide', () => this.onClose(), { once: true });

    // Handle opener window unload
    window.addEventListener('beforeunload', () => {
      if (this.pipWindow && !this.pipWindow.closed) {
        this.pipWindow.close();
      }
    }, { once: true });

    return this.pipWindow;
  }

  moveElement(element, placeholder = null) {
    if (!this.pipWindow || this.pipWindow.closed) {
      throw new Error('PiP window is not open');
    }

    // Store original parent and position
    const originalParent = element.parentElement;
    const originalNextSibling = element.nextSibling;

    // Create placeholder if requested
    if (placeholder) {
      originalParent.insertBefore(placeholder, originalNextSibling);
    }

    // Track the moved element
    this.movedElements.set(element, {
      parent: originalParent,
      nextSibling: originalNextSibling,
      placeholder
    });

    // Move to PiP window
    this.pipWindow.document.body.appendChild(element);
  }

  onClose() {
    // Restore all moved elements to their original positions
    this.movedElements.forEach((origin, element) => {
      // Remove placeholder if exists
      if (origin.placeholder && origin.placeholder.parentElement) {
        origin.placeholder.remove();
      }

      // Move element back
      if (origin.parent) {
        if (origin.nextSibling) {
          origin.parent.insertBefore(element, origin.nextSibling);
        } else {
          origin.parent.appendChild(element);
        }
      }
    });

    this.movedElements.clear();
    this.pipWindow = null;

    // Dispatch custom event for app to handle
    window.dispatchEvent(new CustomEvent('pip-closed'));
  }

  close() {
    if (this.pipWindow && !this.pipWindow.closed) {
      this.pipWindow.close();
    }
  }

  get isOpen() {
    return this.pipWindow !== null && !this.pipWindow.closed;
  }
}

// Usage
const pipManager = new PiPManager();

document.querySelector('#enter-pip').addEventListener('click', async () => {
  await pipManager.open({ width: 400, height: 300 });

  const player = document.querySelector('#player');
  const placeholder = document.createElement('div');
  placeholder.className = 'pip-placeholder';
  placeholder.textContent = 'Video is in Picture-in-Picture';

  pipManager.moveElement(player, placeholder);
});

window.addEventListener('pip-closed', () => {
  console.log('PiP window was closed, elements restored');
});

```

--------------------------------

### documentPictureInPicture.window

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

A read-only property to check if a PiP window is currently open.

```APIDOC
## documentPictureInPicture.window

### Description
A read-only property that returns the current PiP window if one is open and not closed, otherwise returns null.

### Response
- **Window | null** - The current PiP window object or null if no window is open.
```

--------------------------------

### Add Interactive Controls to PiP Window

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Injects custom DOM elements into the PiP window to control video playback, volume, and navigation. Requires access to the pipWindow and video element references.

```javascript
// Add custom interactive controls to a PiP video player
function addPiPControls(pipWindow, video) {
  const controlsContainer = pipWindow.document.createElement('div');
  controlsContainer.className = 'pip-controls';
  controlsContainer.style.cssText = `
    position: fixed; bottom: 0; left: 0; right: 0;
    display: flex; gap: 10px; padding: 10px;
    background: rgba(0,0,0,0.8);
  `;

  // Play/Pause button
  const playPauseBtn = pipWindow.document.createElement('button');
  playPauseBtn.textContent = video.paused ? '▶️' : '⏸️';
  playPauseBtn.addEventListener('click', () => {
    if (video.paused) {
      video.play();
      playPauseBtn.textContent = '⏸️';
    } else {
      video.pause();
      playPauseBtn.textContent = '▶️';
    }
  });

  // Mute button
  const muteBtn = pipWindow.document.createElement('button');
  muteBtn.textContent = video.muted ? '🔇' : '🔊';
  muteBtn.addEventListener('click', () => {
    video.muted = !video.muted;
    muteBtn.textContent = video.muted ? '🔇' : '🔊';
  });

  // Progress bar
  const progressBar = pipWindow.document.createElement('input');
  progressBar.type = 'range';
  progressBar.min = 0;
  progressBar.max = 100;
  progressBar.value = 0;
  progressBar.style.flexGrow = '1';
  video.addEventListener('timeupdate', () => {
    progressBar.value = (video.currentTime / video.duration) * 100;
  });
  progressBar.addEventListener('input', () => {
    video.currentTime = (progressBar.value / 100) * video.duration;
  });

  // Return to tab button
  const returnBtn = pipWindow.document.createElement('button');
  returnBtn.textContent = '↩️ Return to tab';
  returnBtn.addEventListener('click', () => {
    window.focus(); // Focus the opener window
    pipWindow.close(); // Optionally close the PiP window
  });

  controlsContainer.append(playPauseBtn, muteBtn, progressBar, returnBtn);
  pipWindow.document.body.appendChild(controlsContainer);
}
```

--------------------------------

### Resize PiP Window Programmatically

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Uses resizeTo and resizeBy methods to adjust window dimensions. These operations must be triggered by a user gesture within the PiP window.

```javascript
// Add resize controls to PiP window (requires user gesture)
function addResizeControls(pipWindow) {
  const resizeContainer = pipWindow.document.createElement('div');
  resizeContainer.style.cssText = `
    position: fixed; top: 5px; right: 5px;
    display: flex; gap: 5px;
  `;

  // Expand button
  const expandBtn = pipWindow.document.createElement('button');
  expandBtn.textContent = '⬆️ Expand';
  expandBtn.addEventListener('click', () => {
    // Increase window size by 50px in each direction
    pipWindow.resizeBy(50, 50);
    console.log('New size:', pipWindow.innerWidth, 'x', pipWindow.innerHeight);
  });

  // Shrink button
  const shrinkBtn = pipWindow.document.createElement('button');
  shrinkBtn.textContent = '⬇️ Shrink';
  shrinkBtn.addEventListener('click', () => {
    // Decrease window size by 50px in each direction
    pipWindow.resizeBy(-50, -50);
  });

  // Preset size button
  const presetBtn = pipWindow.document.createElement('button');
  presetBtn.textContent = '📐 Standard';
  presetBtn.addEventListener('click', () => {
    // Set to a specific size (16:9 aspect ratio)
    pipWindow.resizeTo(480, 270);
  });

  resizeContainer.append(expandBtn, shrinkBtn, presetBtn);
  pipWindow.document.body.appendChild(resizeContainer);
}
```

--------------------------------

### Apply CSS for Picture-in-Picture Mode

Source: https://context7.com/wicg/document-picture-in-picture/llms.txt

Uses the display-mode media feature to apply styles specifically when content is rendered in a PiP window. Useful for hiding non-essential UI and optimizing layout for smaller viewports.

```css
/* Styles applied only in PiP mode */
@media all and (display-mode: picture-in-picture) {
  /* Remove margins for compact display */
  body {
    margin: 0;
    padding: 0;
    overflow: hidden;
  }

  /* Smaller fonts for reduced viewport */
  h1 {
    font-size: 0.8em;
    margin: 5px;
  }

  /* Larger click targets for PiP controls */
  button {
    min-width: 44px;
    min-height: 44px;
    font-size: 1.2em;
  }

  /* Hide non-essential elements */
  .sidebar,
  .comments,
  .recommendations {
    display: none;
  }

  /* Make video fill the window */
  video {
    width: 100%;
    height: 100%;
    object-fit: contain;
  }

  /* Compact control bar */
  .controls {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 5px;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
  }
}
```

--------------------------------

### Add Event Listeners to PiP Window Controls

Source: https://github.com/wicg/document-picture-in-picture/blob/main/README.md

Creates and appends a custom button to the Picture-in-Picture window that toggles the mute state of a video element. This requires the PiP window to be open.

```javascript
const pipVideo = pipWindow.document.querySelector("#video");
const pipMuteButton = pipWindow.document.createElement("button");
pipMuteButton.textContent = "Toggle mute";
pipMuteButton.addEventListener("click", () => {
  pipVideo.muted = !pipVideo.muted;
});
pipWindow.document.body.append(pipMuteButton);
```

--------------------------------

### Programmatically Resize PiP Window

Source: https://github.com/wicg/document-picture-in-picture/blob/main/README.md

Adds a button to the Picture-in-Picture window that, when clicked, resizes the PiP window by a specified amount. This functionality requires a user gesture within the PiP window.

```javascript
const expandButton = pipWindow.document.createElement('button');
expandButton.textContent = 'Expand PiP Window';
expandButton.addEventListener('click', () => {
  // Expand the PiP window's width by 20px and height by 30px.
  pipWindow.resizeBy(20, 30);
});
pipWindow.document.body.append(expandButton);
```

--------------------------------

### Access and Modify PiP Window Elements

Source: https://github.com/wicg/document-picture-in-picture/blob/main/README.md

Selects an element within the Picture-in-Picture window and modifies its properties. Ensure the PiP window is open and the element exists.

```javascript
const pipVideo = pipWindow.document.querySelector("#video");
pipVideo.loop = true;
```

--------------------------------

### Handle PiP Window Closing and Element Return

Source: https://github.com/wicg/document-picture-in-picture/blob/main/README.md

This function is called when the Picture-in-Picture window closes. It removes PiP-specific styling from the main container and appends the video player back to the main document. It also resets the global `pipWindow` variable.

```javascript
// Called when the PiP window has closed.
function onLeavePiP() {
  if (this !== pipWindow) {
    return;
  }

  // Remove PiP styling from the container.
  const playerContainer = document.querySelector("#player-container");
  playerContainer.classList.remove("pip-mode");

  // Add the player back to the main window.
  const pipPlayer = pipWindow.document.querySelector("#player");
  playerContainer.append(pipPlayer);

  pipWindow = null;
}
```

--------------------------------

### Add a Contributor

Source: https://github.com/wicg/document-picture-in-picture/blob/main/CONTRIBUTING.md

Use this syntax in a pull request comment to add a contributor other than yourself.

```text
+@github_username
```

--------------------------------

### Remove a Contributor

Source: https://github.com/wicg/document-picture-in-picture/blob/main/CONTRIBUTING.md

Use this syntax in a pull request comment to remove a contributor, including yourself if needed.

```text
-@github_username
```

--------------------------------

### Close Picture-in-Picture Window Programmatically

Source: https://github.com/wicg/document-picture-in-picture/blob/main/README.md

Closes the Picture-in-Picture window. This action will trigger the 'pagehide' event listener, allowing for cleanup and returning elements to the main document.

```javascript
// This will close the PiP window and trigger our existing onLeavePiP()
// listener.
pipWindow.close();
```

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