Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 1447 insertions, 0 deletions

diff --git a/toolkit/components/pictureinpicture/content/pictureInPicturePanel.xhtml b/toolkit/components/pictureinpicture/content/pictureInPicturePanel.xhtml
new file mode 100644
index 0000000000..30d6b93d59
--- /dev/null
+++ b/toolkit/components/pictureinpicture/content/pictureInPicturePanel.xhtml
@@ -0,0 +1,47 @@
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<html:template id="PictureInPicturePanelTemplate">
+  <panel
+    id="PictureInPicturePanel"
+    class="panel-no-padding"
+    type="arrow"
+    orient="vertical"
+    level="parent"
+    tabspecific="true"
+    onpopupshown="PictureInPicture.onPipPanelShown(event);"
+    onpopuphidden="PictureInPicture.onPipPanelHidden(event)"
+  >
+    <box class="panel-header">
+      <html:h1>
+        <html:span data-l10n-id="picture-in-picture-panel-header" />
+      </html:h1>
+    </box>
+    <toolbarseparator />
+    <vbox id="PictureInPicturePanelBody">
+      <html:div data-l10n-id="picture-in-picture-panel-headline" />
+      <html:div>
+        <html:span
+          class="deemphasized"
+          data-l10n-id="picture-in-picture-panel-body"
+        />
+        <html:a
+          is="moz-support-link"
+          id="pip-learn-more-link"
+          support-page="about-picture-picture-firefox"
+          data-l10n-name="support-link"
+        />
+      </html:div>
+    </vbox>
+    <toolbarseparator />
+    <vbox id="PictureInPicturePanelFooter">
+      <html:moz-toggle
+        id="respect-pipDisabled-switch"
+        data-l10n-id="picture-in-picture-enable-toggle"
+        data-l10n-attrs="label"
+        onclick="PictureInPicture.toggleRespectDisablePip(event);"
+      />
+    </vbox>
+  </panel>
+</html:template>
diff --git a/toolkit/components/pictureinpicture/content/player.js b/toolkit/components/pictureinpicture/content/player.js
new file mode 100644
index 0000000000..531959d849
--- /dev/null
+++ b/toolkit/components/pictureinpicture/content/player.js
@@ -0,0 +1,1283 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const { PictureInPicture } = ChromeUtils.importESModule(
+  "resource://gre/modules/PictureInPicture.sys.mjs"
+);
+const { ShortcutUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/ShortcutUtils.sys.mjs"
+);
+const { DeferredTask } = ChromeUtils.importESModule(
+  "resource://gre/modules/DeferredTask.sys.mjs"
+);
+const { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+
+const AUDIO_TOGGLE_ENABLED_PREF =
+  "media.videocontrols.picture-in-picture.audio-toggle.enabled";
+const KEYBOARD_CONTROLS_ENABLED_PREF =
+  "media.videocontrols.picture-in-picture.keyboard-controls.enabled";
+const CAPTIONS_ENABLED_PREF =
+  "media.videocontrols.picture-in-picture.display-text-tracks.enabled";
+const CAPTIONS_TOGGLE_ENABLED_PREF =
+  "media.videocontrols.picture-in-picture.display-text-tracks.toggle.enabled";
+const TEXT_TRACK_FONT_SIZE_PREF =
+  "media.videocontrols.picture-in-picture.display-text-tracks.size";
+const IMPROVED_CONTROLS_ENABLED_PREF =
+  "media.videocontrols.picture-in-picture.improved-video-controls.enabled";
+
+// Time to fade the Picture-in-Picture video controls after first opening.
+const CONTROLS_FADE_TIMEOUT_MS = 3000;
+const RESIZE_DEBOUNCE_RATE_MS = 500;
+
+/**
+Quadrants!
+* 2 | 1
+* 3 | 4
+*/
+const TOP_RIGHT_QUADRANT = 1;
+const TOP_LEFT_QUADRANT = 2;
+const BOTTOM_LEFT_QUADRANT = 3;
+const BOTTOM_RIGHT_QUADRANT = 4;
+
+/**
+ * Public function to be called from PictureInPicture.jsm. This is the main
+ * entrypoint for initializing the player window.
+ *
+ * @param {Number} id
+ *   A unique numeric ID for the window, used for Telemetry Events.
+ * @param {WindowGlobalParent} wgp
+ *   The WindowGlobalParent that is hosting the originating video.
+ * @param {ContentDOMReference} videoRef
+ *    A reference to the video element that a Picture-in-Picture window
+ *    is being created for
+ */
+function setupPlayer(id, wgp, videoRef) {
+  Player.init(id, wgp, videoRef);
+}
+
+/**
+ * Public function to be called from PictureInPicture.jsm. This update the
+ * controls based on whether or not the video is playing.
+ *
+ * @param {Boolean} isPlaying
+ *   True if the Picture-in-Picture video is playing.
+ */
+function setIsPlayingState(isPlaying) {
+  Player.isPlaying = isPlaying;
+}
+
+/**
+ * Public function to be called from PictureInPicture.jsm. This update the
+ * controls based on whether or not the video is muted.
+ *
+ * @param {Boolean} isMuted
+ *   True if the Picture-in-Picture video is muted.
+ */
+function setIsMutedState(isMuted) {
+  Player.isMuted = isMuted;
+}
+
+/**
+ * Function to resize and reposition the PiP window
+ * @param {Object} rect
+ *   An object containing `left`, `top`, `width`, and `height` for the PiP
+ *   window
+ */
+function resizeToVideo(rect) {
+  Player.resizeToVideo(rect);
+}
+
+/**
+ * Returns an object containing `left`, `top`, `width`, and `height` of the
+ * PiP window before entering fullscreen. Will be null if the PiP window is
+ * not in fullscreen.
+ */
+function getDeferredResize() {
+  return Player.deferredResize;
+}
+
+function enableSubtitlesButton() {
+  Player.enableSubtitlesButton();
+}
+
+function disableSubtitlesButton() {
+  Player.disableSubtitlesButton();
+}
+
+function setScrubberPosition(position) {
+  Player.setScrubberPosition(position);
+}
+
+function setTimestamp(timeString) {
+  Player.setTimestamp(timeString);
+}
+
+/**
+ * The Player object handles initializing the player, holds state, and handles
+ * events for updating state.
+ */
+let Player = {
+  WINDOW_EVENTS: [
+    "click",
+    "contextmenu",
+    "dblclick",
+    "keydown",
+    "mouseup",
+    "mousemove",
+    "MozDOMFullscreen:Entered",
+    "MozDOMFullscreen:Exited",
+    "resize",
+    "unload",
+    "draggableregionleftmousedown",
+  ],
+  actor: null,
+  /**
+   * Used for resizing Telemetry to avoid recording an event for every resize
+   * event. Instead, we wait until RESIZE_DEBOUNCE_RATE_MS has passed since the
+   * last resize event before recording.
+   */
+  resizeDebouncer: null,
+  /**
+   * Used for Telemetry to identify the window.
+   */
+  id: -1,
+
+  /**
+   * When set to a non-null value, a timer is scheduled to hide the controls
+   * after CONTROLS_FADE_TIMEOUT_MS milliseconds.
+   */
+  showingTimeout: null,
+
+  /**
+   * Used to determine old window location when mouseup-ed for corner
+   * snapping drag vector calculation
+   */
+  oldMouseUpWindowX: window.screenX,
+  oldMouseUpWindowY: window.screenY,
+
+  /**
+   * Used to determine if hovering the mouse cursor over the pip window or not.
+   * Gets updated whenever a new hover state is detected.
+   */
+  isCurrentHover: false,
+
+  /**
+   * Store the size and position of the window before entering fullscreen and
+   * use this to correctly position the window when exiting fullscreen
+   */
+  deferredResize: null,
+
+  /**
+   * Initializes the player browser, and sets up the initial state.
+   *
+   * @param {Number} id
+   *   A unique numeric ID for the window, used for Telemetry Events.
+   * @param {WindowGlobalParent} wgp
+   *   The WindowGlobalParent that is hosting the originating video.
+   * @param {ContentDOMReference} videoRef
+   *    A reference to the video element that a Picture-in-Picture window
+   *    is being created for
+   */
+  init(id, wgp, videoRef) {
+    this.id = id;
+
+    // State for whether or not we are adjusting the time via the scrubber
+    this.scrubbing = false;
+
+    let holder = document.querySelector(".player-holder");
+    let browser = document.getElementById("browser");
+    browser.remove();
+
+    browser.setAttribute("nodefaultsrc", "true");
+
+    this.setupTooltip("close", "pictureinpicture-close-btn", "closeShortcut");
+    let strId = this.isFullscreen
+      ? `pictureinpicture-exit-fullscreen-btn2`
+      : `pictureinpicture-fullscreen-btn2`;
+    this.setupTooltip("fullscreen", strId, "fullscreenToggleShortcut");
+
+    // Set the specific remoteType and browsingContextGroupID to use for the
+    // initial about:blank load. The combination of these two properties will
+    // ensure that the browser loads in the same process as our originating
+    // browser.
+    browser.setAttribute("remoteType", wgp.domProcess.remoteType);
+    browser.setAttribute(
+      "initialBrowsingContextGroupId",
+      wgp.browsingContext.group.id
+    );
+    holder.appendChild(browser);
+
+    this.actor =
+      browser.browsingContext.currentWindowGlobal.getActor("PictureInPicture");
+    this.actor.sendAsyncMessage("PictureInPicture:SetupPlayer", {
+      videoRef,
+    });
+
+    PictureInPicture.weakPipToWin.set(this.actor, window);
+
+    for (let eventType of this.WINDOW_EVENTS) {
+      addEventListener(eventType, this);
+    }
+
+    this.controls.addEventListener("mouseleave", () => {
+      this.onMouseLeave();
+    });
+    this.controls.addEventListener("mouseenter", () => {
+      this.onMouseEnter();
+    });
+
+    this.scrubber.addEventListener("input", event => {
+      this.handleScrubbing(event);
+    });
+    this.scrubber.addEventListener("change", event => {
+      this.handleScrubbingDone(event);
+    });
+
+    for (let radio of document.querySelectorAll(
+      'input[type=radio][name="cc-size"]'
+    )) {
+      radio.addEventListener("change", event => {
+        this.onSubtitleChange(event.target.id);
+      });
+    }
+
+    document
+      .querySelector("#subtitles-toggle")
+      .addEventListener("change", () => {
+        this.onToggleChange();
+      });
+
+    // If the content process hosting the video crashes, let's
+    // just close the window for now.
+    browser.addEventListener("oop-browser-crashed", this);
+
+    this.revealControls(false);
+
+    if (Services.prefs.getBoolPref(AUDIO_TOGGLE_ENABLED_PREF, false)) {
+      const audioButton = document.getElementById("audio");
+      audioButton.hidden = false;
+    }
+
+    if (Services.prefs.getBoolPref(CAPTIONS_ENABLED_PREF, false)) {
+      this.closedCaptionButton.hidden = false;
+    }
+
+    if (Services.prefs.getBoolPref(IMPROVED_CONTROLS_ENABLED_PREF, false)) {
+      const fullscreenButton = document.getElementById("fullscreen");
+      fullscreenButton.hidden = false;
+
+      const seekBackwardButton = document.getElementById("seekBackward");
+      seekBackwardButton.hidden = false;
+
+      const seekForwardButton = document.getElementById("seekForward");
+      seekForwardButton.hidden = false;
+
+      this.scrubber.hidden = false;
+      this.timestamp.hidden = false;
+
+      const controlsBottomGradient = document.getElementById(
+        "controls-bottom-gradient"
+      );
+      controlsBottomGradient.hidden = false;
+    }
+
+    this.alignEndControlsButtonTooltips();
+
+    this.resizeDebouncer = new DeferredTask(() => {
+      this.alignEndControlsButtonTooltips();
+      this.recordEvent("resize", {
+        width: window.outerWidth.toString(),
+        height: window.outerHeight.toString(),
+      });
+    }, RESIZE_DEBOUNCE_RATE_MS);
+
+    this.computeAndSetMinimumSize(window.outerWidth, window.outerHeight);
+
+    // alwaysontop windows are not focused by default, so we have to do it
+    // ourselves. We use requestAnimationFrame since we have to wait until the
+    // window is visible before it can focus.
+    window.requestAnimationFrame(() => {
+      window.focus();
+    });
+
+    let fontSize = Services.prefs.getCharPref(
+      TEXT_TRACK_FONT_SIZE_PREF,
+      "medium"
+    );
+
+    // fallback to medium if the pref value is not a valid option
+    if (fontSize === "small" || fontSize === "large") {
+      document.querySelector(`#${fontSize}`).checked = "true";
+    } else {
+      document.querySelector("#medium").checked = "true";
+    }
+  },
+
+  uninit() {
+    this.resizeDebouncer.disarm();
+    PictureInPicture.unload(window, this.actor);
+  },
+
+  setupTooltip(elId, l10nId, shortcutId) {
+    const el = document.getElementById(elId);
+    const shortcut = document.getElementById(shortcutId);
+    let l10nObj = shortcut
+      ? { shortcut: ShortcutUtils.prettifyShortcut(shortcut) }
+      : {};
+    document.l10n.setAttributes(el, l10nId, l10nObj);
+  },
+
+  handleEvent(event) {
+    switch (event.type) {
+      case "click": {
+        // Don't run onClick if middle or right click is pressed respectively
+        if (event.button !== 1 && event.button !== 2) {
+          this.onClick(event);
+          this.controls.removeAttribute("keying");
+        }
+        break;
+      }
+
+      case "contextmenu": {
+        event.preventDefault();
+        break;
+      }
+
+      case "dblclick": {
+        this.onDblClick(event);
+        break;
+      }
+
+      case "keydown": {
+        if (event.keyCode == KeyEvent.DOM_VK_TAB) {
+          this.controls.setAttribute("keying", true);
+          this.showVideoControls();
+        } else if (event.keyCode == KeyEvent.DOM_VK_ESCAPE) {
+          let isSettingsPanelInFocus = this.settingsPanel.contains(
+            document.activeElement
+          );
+
+          event.preventDefault();
+
+          if (!this.settingsPanel.classList.contains("hide")) {
+            // If the subtitles settings panel is open, let the ESC key close it
+            this.toggleSubtitlesSettingsPanel({ forceHide: true });
+            if (isSettingsPanelInFocus) {
+              document.getElementById("closed-caption").focus();
+            }
+          } else if (this.isFullscreen) {
+            // We handle the ESC key, in fullscreen modus as intent to leave only the fullscreen mode
+            document.exitFullscreen();
+          } else {
+            // We handle the ESC key, as an intent to leave the picture-in-picture modus
+            this.onClose();
+          }
+        } else if (
+          Services.prefs.getBoolPref(KEYBOARD_CONTROLS_ENABLED_PREF, false) &&
+          (event.keyCode != KeyEvent.DOM_VK_SPACE || !event.target.id)
+        ) {
+          // Pressing "space" fires a "keydown" event which can also trigger a control
+          // button's "click" event. Handle the "keydown" event only when the event did
+          // not originate from a control button and it is not a "space" keypress.
+          this.onKeyDown(event);
+        }
+
+        break;
+      }
+
+      case "mouseup": {
+        this.onMouseUp(event);
+        break;
+      }
+
+      case "mousemove": {
+        this.onMouseMove();
+        break;
+      }
+
+      // Normally, the DOMFullscreenParent / DOMFullscreenChild actors
+      // would take care of firing the `fullscreen-painted` notification,
+      // however, those actors are only ever instantiated when a <browser>
+      // is fullscreened, and not a <body> element in a parent-process
+      // chrome privileged DOM window.
+      //
+      // Rather than trying to re-engineer JSWindowActors to be re-usable for
+      // this edge-case, we do the work of firing fullscreen-painted when
+      // transitioning in and out of fullscreen ourselves here.
+      case "MozDOMFullscreen:Entered":
+      // Intentional fall-through
+      case "MozDOMFullscreen:Exited": {
+        let { lastTransactionId } = window.windowUtils;
+        window.addEventListener("MozAfterPaint", function onPainted(event) {
+          if (event.transactionId > lastTransactionId) {
+            window.removeEventListener("MozAfterPaint", onPainted);
+            Services.obs.notifyObservers(window, "fullscreen-painted");
+          }
+        });
+
+        // If we are exiting fullscreen we want to resize the window to the
+        // stored size and position
+        if (this.deferredResize && event.type === "MozDOMFullscreen:Exited") {
+          this.resizeToVideo(this.deferredResize);
+          this.deferredResize = null;
+        }
+
+        // Sets the title for fullscreen button when PIP is in Enter Fullscreen mode and Exit Fullscreen mode
+        let strId = this.isFullscreen
+          ? `pictureinpicture-exit-fullscreen-btn2`
+          : `pictureinpicture-fullscreen-btn2`;
+        this.setupTooltip("fullscreen", strId, "fullscreenToggleShortcut");
+
+        window.focus();
+
+        if (this.isFullscreen) {
+          this.actor.sendAsyncMessage("PictureInPicture:EnterFullscreen", {
+            isFullscreen: true,
+            isVideoControlsShowing: null,
+            playerBottomControlsDOMRect: null,
+          });
+        } else {
+          this.actor.sendAsyncMessage("PictureInPicture:ExitFullscreen", {
+            isFullscreen: this.isFullscreen,
+            isVideoControlsShowing:
+              !!this.controls.getAttribute("showing") ||
+              !!this.controls.getAttribute("keying"),
+            playerBottomControlsDOMRect:
+              this.controlsBottom.getBoundingClientRect(),
+          });
+        }
+        // The subtitles settings panel gets selected when entering/exiting fullscreen even though
+        // user-select is set to none. I don't know why this happens or how to prevent so we just
+        // remove the selection when fullscreen is entered/exited.
+        let selection = window.getSelection();
+        selection.removeAllRanges();
+        break;
+      }
+
+      case "oop-browser-crashed": {
+        this.closePipWindow({ reason: "browser-crash" });
+        break;
+      }
+
+      case "resize": {
+        this.onResize(event);
+        break;
+      }
+
+      case "unload": {
+        this.uninit();
+        break;
+      }
+
+      case "draggableregionleftmousedown": {
+        this.toggleSubtitlesSettingsPanel({ forceHide: true });
+        break;
+      }
+    }
+  },
+
+  /**
+   * This function handles when the scrubber is being scrubbed by the mouse
+   * because if we get an input event from the keyboard, onKeyDown will set
+   * this.preventNextInputEvent to true.
+   * This function is called by input events on the scrubber
+   * @param {Event} event The input event
+   */
+  handleScrubbing(event) {
+    // When using the keyboard to scrub, we get both a keydown and an input
+    // event. The input event is fired after the keydown and we have already
+    // handle the keydown event in onKeyDown and we don't want to handle it twice
+    if (this.preventNextInputEvent) {
+      this.preventNextInputEvent = false;
+      return;
+    }
+    if (!this.scrubbing) {
+      this.wasPlaying = this.isPlaying;
+      if (this.isPlaying) {
+        this.actor.sendAsyncMessage("PictureInPicture:Pause");
+      }
+      this.scrubbing = true;
+    }
+    let scrubberPosition = this.getScrubberPositionFromEvent(event);
+    this.setVideoTime(scrubberPosition);
+  },
+
+  /**
+   * This function handles setting the scrubbing state to false and playing
+   * the video if we paused it before scrubbing.
+   * @param {Event} event The change event
+   */
+  handleScrubbingDone(event) {
+    if (!this.scrubbing) {
+      return;
+    }
+    let scrubberPosition = this.getScrubberPositionFromEvent(event);
+    this.setVideoTime(scrubberPosition);
+    if (this.wasPlaying) {
+      this.actor.sendAsyncMessage("PictureInPicture:Play");
+    }
+    this.scrubbing = false;
+  },
+
+  getScrubberPositionFromEvent(event) {
+    return event.target.value;
+  },
+
+  setVideoTime(scrubberPosition) {
+    let wasPlaying = this.scrubbing ? this.wasPlaying : this.isPlaying;
+    this.setScrubberPosition(scrubberPosition);
+    this.actor.sendAsyncMessage("PictureInPicture:SetVideoTime", {
+      scrubberPosition,
+      wasPlaying,
+    });
+  },
+
+  setScrubberPosition(value) {
+    this.scrubber.value = value;
+    this.scrubber.hidden = value === undefined;
+
+    // Also hide the seek buttons when we hide the scrubber
+    this.seekBackward.hidden = value === undefined;
+    this.seekForward.hidden = value === undefined;
+  },
+
+  setTimestamp(timestamp) {
+    this.timestamp.textContent = timestamp;
+    this.timestamp.hidden = timestamp === undefined;
+  },
+
+  closePipWindow(closeData) {
+    // Set the subtitles font size prefs
+    Services.prefs.setBoolPref(
+      CAPTIONS_TOGGLE_ENABLED_PREF,
+      document.querySelector("#subtitles-toggle").checked
+    );
+    for (let radio of document.querySelectorAll(
+      'input[type=radio][name="cc-size"]'
+    )) {
+      if (radio.checked) {
+        Services.prefs.setCharPref(TEXT_TRACK_FONT_SIZE_PREF, radio.id);
+        break;
+      }
+    }
+    const { reason } = closeData;
+    PictureInPicture.closeSinglePipWindow({ reason, actorRef: this.actor });
+  },
+
+  onDblClick(event) {
+    if (event.target.id == "controls") {
+      this.fullscreenModeToggle();
+      event.preventDefault();
+    }
+  },
+
+  onClick(event) {
+    switch (event.target.id) {
+      case "audio": {
+        if (this.isMuted) {
+          this.actor.sendAsyncMessage("PictureInPicture:Unmute");
+        } else {
+          this.actor.sendAsyncMessage("PictureInPicture:Mute");
+        }
+        break;
+      }
+
+      case "close": {
+        this.onClose();
+        break;
+      }
+
+      case "playpause": {
+        if (!this.isPlaying) {
+          this.actor.sendAsyncMessage("PictureInPicture:Play");
+          this.revealControls(false);
+        } else {
+          this.actor.sendAsyncMessage("PictureInPicture:Pause");
+          this.revealControls(true);
+        }
+
+        break;
+      }
+
+      case "seekBackward": {
+        this.actor.sendAsyncMessage("PictureInPicture:SeekBackward");
+        break;
+      }
+
+      case "seekForward": {
+        this.actor.sendAsyncMessage("PictureInPicture:SeekForward");
+        break;
+      }
+
+      case "unpip": {
+        PictureInPicture.focusTabAndClosePip(window, this.actor);
+        break;
+      }
+
+      case "closed-caption": {
+        let options = {};
+        if (event.mozInputSource == MouseEvent.MOZ_SOURCE_KEYBOARD) {
+          options.isKeyboard = true;
+        }
+        this.toggleSubtitlesSettingsPanel(options);
+        // Early return to prevent hiding the panel below
+        return;
+      }
+
+      case "fullscreen": {
+        this.fullscreenModeToggle();
+        this.recordEvent("fullscreen", {
+          enter: (!this.isFullscreen).toString(),
+        });
+        break;
+      }
+
+      case "font-size-selection-radio-small": {
+        document.getElementById("small").click();
+        break;
+      }
+
+      case "font-size-selection-radio-medium": {
+        document.getElementById("medium").click();
+        break;
+      }
+
+      case "font-size-selection-radio-large": {
+        document.getElementById("large").click();
+        break;
+      }
+    }
+    // If the click came from a element that is not inside the subtitles settings panel
+    // then we want to hide the panel
+    if (!this.settingsPanel.contains(event.target)) {
+      this.toggleSubtitlesSettingsPanel({ forceHide: true });
+    }
+  },
+
+  /**
+   * Function to toggle the visibility of the subtitles settings panel
+   * @param {Object} options [optional] Object containing options for the function
+   *   - forceHide: true to force hide the subtitles settings panel
+   *   - isKeyboard: true if the subtitles button was activated using the keyboard
+   *     to show or hide the subtitles settings panel
+   */
+  toggleSubtitlesSettingsPanel(options) {
+    let settingsPanelVisible = !this.settingsPanel.classList.contains("hide");
+    if (options?.forceHide || settingsPanelVisible) {
+      this.settingsPanel.classList.add("hide");
+      this.closedCaptionButton.setAttribute("aria-expanded", false);
+      this.controls.removeAttribute("donthide");
+
+      if (
+        this.controls.getAttribute("keying") ||
+        this.isCurrentHover ||
+        this.controls.getAttribute("showing")
+      ) {
+        return;
+      }
+
+      this.actor.sendAsyncMessage("PictureInPicture:HideVideoControls", {
+        isFullscreen: this.isFullscreen,
+        isVideoControlsShowing: false,
+        playerBottomControlsDOMRect: null,
+      });
+    } else {
+      this.settingsPanel.classList.remove("hide");
+      this.closedCaptionButton.setAttribute("aria-expanded", true);
+      this.controls.setAttribute("donthide", true);
+      this.showVideoControls();
+
+      if (options?.isKeyboard) {
+        document.querySelector("#subtitles-toggle").focus();
+      }
+    }
+  },
+
+  onClose() {
+    this.actor.sendAsyncMessage("PictureInPicture:Pause", {
+      reason: "pip-closed",
+    });
+    this.closePipWindow({ reason: "closeButton" });
+  },
+
+  fullscreenModeToggle() {
+    if (this.isFullscreen) {
+      document.exitFullscreen();
+    } else {
+      this.deferredResize = {
+        left: window.screenX,
+        top: window.screenY,
+        width: window.innerWidth,
+        height: window.innerHeight,
+      };
+      document.body.requestFullscreen();
+    }
+  },
+
+  resizeToVideo(rect) {
+    if (this.isFullscreen) {
+      // We store the size and position because resizing the PiP window
+      // while fullscreened will cause issues
+      this.deferredResize = rect;
+    } else {
+      let { left, top, width, height } = rect;
+      window.resizeTo(width, height);
+      window.moveTo(left, top);
+    }
+  },
+
+  onKeyDown(event) {
+    // We don't want to send a keydown event if the event target was one of the
+    // font sizes in the settings panel
+    if (
+      event.target.parentElement?.parentElement?.classList?.contains(
+        "font-size-selection"
+      )
+    ) {
+      return;
+    }
+
+    let eventKeys = {
+      altKey: event.altKey,
+      shiftKey: event.shiftKey,
+      metaKey: event.metaKey,
+      ctrlKey: event.ctrlKey,
+      keyCode: event.keyCode,
+    };
+
+    // If the up or down arrow is pressed while the scrubber is focused then we
+    // want to hijack these keydown events to act as left or right arrow
+    // respectively to correctly seek the video.
+    if (
+      event.target.id === "scrubber" &&
+      event.keyCode === window.KeyEvent.DOM_VK_UP
+    ) {
+      eventKeys.keyCode = window.KeyEvent.DOM_VK_RIGHT;
+    } else if (
+      event.target.id === "scrubber" &&
+      event.keyCode === window.KeyEvent.DOM_VK_DOWN
+    ) {
+      eventKeys.keyCode = window.KeyEvent.DOM_VK_LEFT;
+    }
+
+    // If the keydown event was one of the arrow keys and the scrubber was
+    // focused then we will also get an input event that will overwrite the
+    // keydown event if we dont' prevent the input event.
+    if (
+      event.target.id === "scrubber" &&
+      [
+        window.KeyEvent.DOM_VK_LEFT,
+        window.KeyEvent.DOM_VK_RIGHT,
+        window.KeyEvent.DOM_VK_UP,
+        window.KeyEvent.DOM_VK_DOWN,
+      ].includes(event.keyCode)
+    ) {
+      this.preventNextInputEvent = true;
+    }
+
+    this.actor.sendAsyncMessage("PictureInPicture:KeyDown", eventKeys);
+  },
+
+  onSubtitleChange(size) {
+    Services.prefs.setCharPref(TEXT_TRACK_FONT_SIZE_PREF, size);
+
+    this.actor.sendAsyncMessage("PictureInPicture:ChangeFontSizeTextTracks");
+  },
+
+  onToggleChange() {
+    // The subtitles toggle has been click in the settings panel so we toggle
+    // the overlay above the font sizes and send a message to toggle the
+    // visibility of the subtitles and set the toggle pref
+    document
+      .querySelector(".font-size-selection")
+      .classList.toggle("font-size-overlay");
+    this.actor.sendAsyncMessage("PictureInPicture:ToggleTextTracks");
+
+    this.captionsToggleEnabled = !this.captionsToggleEnabled;
+    Services.prefs.setBoolPref(
+      CAPTIONS_TOGGLE_ENABLED_PREF,
+      this.captionsToggleEnabled
+    );
+  },
+
+  /**
+   * PiP Corner Snapping Helper Function
+   * Determines the quadrant the PiP window is currently in.
+   */
+  determineCurrentQuadrant() {
+    // Determine center coordinates of window.
+    let windowCenterX = window.screenX + window.innerWidth / 2;
+    let windowCenterY = window.screenY + window.innerHeight / 2;
+    let quadrant = null;
+    let halfWidth = window.screen.availLeft + window.screen.availWidth / 2;
+    let halfHeight = window.screen.availTop + window.screen.availHeight / 2;
+
+    let leftHalf = windowCenterX < halfWidth;
+    let rightHalf = windowCenterX > halfWidth;
+    let topHalf = windowCenterY < halfHeight;
+    let bottomHalf = windowCenterY > halfHeight;
+
+    if (leftHalf && topHalf) {
+      quadrant = TOP_LEFT_QUADRANT;
+    } else if (rightHalf && topHalf) {
+      quadrant = TOP_RIGHT_QUADRANT;
+    } else if (leftHalf && bottomHalf) {
+      quadrant = BOTTOM_LEFT_QUADRANT;
+    } else if (rightHalf && bottomHalf) {
+      quadrant = BOTTOM_RIGHT_QUADRANT;
+    }
+    return quadrant;
+  },
+
+  /**
+   * Helper function to actually move/snap the PiP window.
+   * Moves the PiP window to the top right.
+   */
+  moveToTopRight() {
+    window.moveTo(
+      window.screen.availLeft + window.screen.availWidth - window.innerWidth,
+      window.screen.availTop
+    );
+  },
+
+  /**
+   * Moves the PiP window to the top left.
+   */
+  moveToTopLeft() {
+    window.moveTo(window.screen.availLeft, window.screen.availTop);
+  },
+
+  /**
+   * Moves the PiP window to the bottom right.
+   */
+  moveToBottomRight() {
+    window.moveTo(
+      window.screen.availLeft + window.screen.availWidth - window.innerWidth,
+      window.screen.availTop + window.screen.availHeight - window.innerHeight
+    );
+  },
+
+  /**
+   * Moves the PiP window to the bottom left.
+   */
+  moveToBottomLeft() {
+    window.moveTo(
+      window.screen.availLeft,
+      window.screen.availTop + window.screen.availHeight - window.innerHeight
+    );
+  },
+
+  /**
+   * Uses the PiP window's change in position to determine which direction
+   * the window has been moved in.
+   */
+  determineDirectionDragged() {
+    // Determine change in window location.
+    let deltaX = this.oldMouseUpWindowX - window.screenX;
+    let deltaY = this.oldMouseUpWindowY - window.screenY;
+    let dragDirection = "";
+
+    if (Math.abs(deltaX) > Math.abs(deltaY) && deltaX < 0) {
+      dragDirection = "draggedRight";
+    } else if (Math.abs(deltaX) > Math.abs(deltaY) && deltaX > 0) {
+      dragDirection = "draggedLeft";
+    } else if (Math.abs(deltaX) < Math.abs(deltaY) && deltaY < 0) {
+      dragDirection = "draggedDown";
+    } else if (Math.abs(deltaX) < Math.abs(deltaY) && deltaY > 0) {
+      dragDirection = "draggedUp";
+    }
+    return dragDirection;
+  },
+
+  /**
+   * Event handler for "mouseup" events on the PiP window.
+   *
+   * @param {Event} event
+   *  Event context details
+   */
+  onMouseUp(event) {
+    // Corner snapping changes start here.
+    // Check if metakey pressed and macOS
+    let quadrant = this.determineCurrentQuadrant();
+    let dragAction = this.determineDirectionDragged();
+
+    if (event.metaKey && AppConstants.platform == "macosx" && dragAction) {
+      // Moving logic based on current quadrant and direction of drag.
+      switch (quadrant) {
+        case TOP_RIGHT_QUADRANT:
+          switch (dragAction) {
+            case "draggedRight":
+              this.moveToTopRight();
+              break;
+            case "draggedLeft":
+              this.moveToTopLeft();
+              break;
+            case "draggedDown":
+              this.moveToBottomRight();
+              break;
+            case "draggedUp":
+              this.moveToTopRight();
+              break;
+          }
+          break;
+        case TOP_LEFT_QUADRANT:
+          switch (dragAction) {
+            case "draggedRight":
+              this.moveToTopRight();
+              break;
+            case "draggedLeft":
+              this.moveToTopLeft();
+              break;
+            case "draggedDown":
+              this.moveToBottomLeft();
+              break;
+            case "draggedUp":
+              this.moveToTopLeft();
+              break;
+          }
+          break;
+        case BOTTOM_LEFT_QUADRANT:
+          switch (dragAction) {
+            case "draggedRight":
+              this.moveToBottomRight();
+              break;
+            case "draggedLeft":
+              this.moveToBottomLeft();
+              break;
+            case "draggedDown":
+              this.moveToBottomLeft();
+              break;
+            case "draggedUp":
+              this.moveToTopLeft();
+              break;
+          }
+          break;
+        case BOTTOM_RIGHT_QUADRANT:
+          switch (dragAction) {
+            case "draggedRight":
+              this.moveToBottomRight();
+              break;
+            case "draggedLeft":
+              this.moveToBottomLeft();
+              break;
+            case "draggedDown":
+              this.moveToBottomRight();
+              break;
+            case "draggedUp":
+              this.moveToTopRight();
+              break;
+          }
+          break;
+      } // Switch close.
+    } // Metakey close.
+    this.oldMouseUpWindowX = window.screenX;
+    this.oldMouseUpWindowY = window.screenY;
+  },
+
+  /**
+   * Event handler for mousemove the PiP Window
+   */
+  onMouseMove() {
+    if (this.isFullscreen) {
+      this.revealControls(false);
+    }
+  },
+
+  onMouseEnter() {
+    if (!this.isFullscreen) {
+      this.isCurrentHover = true;
+      this.showVideoControls();
+    }
+  },
+
+  onMouseLeave() {
+    if (!this.isFullscreen) {
+      this.isCurrentHover = false;
+      if (
+        !this.controls.getAttribute("showing") &&
+        !this.controls.getAttribute("keying") &&
+        !this.controls.getAttribute("donthide")
+      ) {
+        this.actor.sendAsyncMessage("PictureInPicture:HideVideoControls", {
+          isFullscreen: this.isFullscreen,
+          isVideoControlsShowing: false,
+          playerBottomControlsDOMRect: null,
+        });
+      }
+    }
+  },
+
+  enableSubtitlesButton() {
+    this.closedCaptionButton.disabled = false;
+
+    this.alignEndControlsButtonTooltips();
+    this.captionsToggleEnabled = true;
+    // If the CAPTIONS_TOGGLE_ENABLED_PREF pref is false then we will click
+    // the UI toggle to change the toggle to unchecked. This will call
+    // onToggleChange where this.captionsToggleEnabled will be updated
+    if (!Services.prefs.getBoolPref(CAPTIONS_TOGGLE_ENABLED_PREF, true)) {
+      document.querySelector("#subtitles-toggle").click();
+    }
+  },
+
+  disableSubtitlesButton() {
+    this.closedCaptionButton.disabled = true;
+
+    this.alignEndControlsButtonTooltips();
+  },
+
+  /**
+   * Sets focus state inline end tooltip for rightmost playback controls
+   */
+  alignEndControlsButtonTooltips() {
+    let audioBtn = document.getElementById("audio");
+    let width = window.outerWidth;
+
+    if (300 < width && width <= 400) {
+      audioBtn.classList.replace("center-tooltip", "inline-end-tooltip");
+    } else {
+      audioBtn.classList.replace("inline-end-tooltip", "center-tooltip");
+    }
+  },
+
+  /**
+   * Event handler for resizing the PiP Window
+   *
+   * @param {Event} event
+   *  Event context data object
+   */
+  onResize(event) {
+    this.toggleSubtitlesSettingsPanel({ forceHide: true });
+    this.resizeDebouncer.disarm();
+    this.resizeDebouncer.arm();
+  },
+
+  /**
+   * Event handler for user issued commands
+   *
+   * @param {Event} event
+   *  Event context data object
+   */
+  onCommand(event) {
+    this.closePipWindow({ reason: "shortcut" });
+  },
+
+  get controls() {
+    delete this.controls;
+    return (this.controls = document.getElementById("controls"));
+  },
+
+  get scrubber() {
+    delete this.scrubber;
+    return (this.scrubber = document.getElementById("scrubber"));
+  },
+
+  get timestamp() {
+    delete this.timestamp;
+    return (this.timestamp = document.getElementById("timestamp"));
+  },
+
+  get controlsBottom() {
+    delete this.controlsBottom;
+    return (this.controlsBottom = document.getElementById("controls-bottom"));
+  },
+
+  get seekBackward() {
+    delete this.seekBackward;
+    return (this.seekBackward = document.getElementById("seekBackward"));
+  },
+
+  get seekForward() {
+    delete this.seekForward;
+    return (this.seekForward = document.getElementById("seekForward"));
+  },
+
+  get closedCaptionButton() {
+    delete this.closedCaptionButton;
+    return (this.closedCaptionButton =
+      document.getElementById("closed-caption"));
+  },
+
+  get settingsPanel() {
+    delete this.settingsPanel;
+    return (this.settingsPanel = document.getElementById("settings"));
+  },
+
+  _isPlaying: false,
+  /**
+   * GET isPlaying returns true if the video is currently playing.
+   *
+   * SET isPlaying to true if the video is playing, false otherwise. This will
+   * update the internal state and displayed controls.
+   *
+   * @type {Boolean}
+   */
+  get isPlaying() {
+    return this._isPlaying;
+  },
+
+  set isPlaying(isPlaying) {
+    this._isPlaying = isPlaying;
+    this.controls.classList.toggle("playing", isPlaying);
+    let strId = isPlaying
+      ? `pictureinpicture-pause-btn`
+      : `pictureinpicture-play-btn`;
+    this.setupTooltip("playpause", strId);
+  },
+
+  _isMuted: false,
+  /**
+   * GET isMuted returns true if the video is currently muted.
+   *
+   * SET isMuted to true if the video is muted, false otherwise. This will
+   * update the internal state and displayed controls.
+   *
+   * @type {Boolean}
+   */
+  get isMuted() {
+    return this._isMuted;
+  },
+
+  set isMuted(isMuted) {
+    this._isMuted = isMuted;
+    this.controls.classList.toggle("muted", isMuted);
+    let strId = isMuted
+      ? `pictureinpicture-unmute-btn`
+      : `pictureinpicture-mute-btn`;
+    let shortcutId = isMuted ? "unMuteShortcut" : "muteShortcut";
+    this.setupTooltip("audio", strId, shortcutId);
+  },
+
+  /**
+   * GET isFullscreen returns true if the video is running in fullscreen mode
+   *
+   * @returns {boolean}
+   */
+  get isFullscreen() {
+    return document.fullscreenElement == document.body;
+  },
+
+  /**
+   * Used for recording telemetry in Picture-in-Picture.
+   *
+   * @param {string} type
+   *   The type of PiP event being recorded.
+   * @param {object} args
+   *   The data to pass to telemetry when the event is recorded.
+   */
+  recordEvent(type, args) {
+    Services.telemetry.recordEvent(
+      "pictureinpicture",
+      type,
+      "player",
+      this.id,
+      args
+    );
+  },
+
+  /**
+   * Send a message to PiPChild to adjust the subtitles position
+   */
+  showVideoControls() {
+    // offsetParent returns null when the element or any ancestor has display: none
+    // See https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetParent
+    this.actor.sendAsyncMessage("PictureInPicture:ShowVideoControls", {
+      isFullscreen: this.isFullscreen,
+      isVideoControlsShowing: true,
+      playerBottomControlsDOMRect: this.controlsBottom.getBoundingClientRect(),
+      isScrubberShowing: !!this.scrubber.offsetParent,
+    });
+  },
+
+  /**
+   * Makes the player controls visible.
+   *
+   * @param {Boolean} revealIndefinitely
+   *   If false, this will hide the controls again after
+   *   CONTROLS_FADE_TIMEOUT_MS milliseconds has passed. If true, the controls
+   *   will remain visible until revealControls is called again with
+   *   revealIndefinitely set to false.
+   */
+  revealControls(revealIndefinitely) {
+    clearTimeout(this.showingTimeout);
+    this.showingTimeout = null;
+
+    this.controls.setAttribute("showing", true);
+
+    if (!this.isFullscreen) {
+      // revealControls() is called everytime we hover over fullscreen pip window.
+      // Only communicate with pipchild when not in fullscreen mode for performance reasons.
+      this.showVideoControls();
+    }
+
+    if (!revealIndefinitely) {
+      this.showingTimeout = setTimeout(() => {
+        const isHoverOverControlItem = this.controls.querySelector(
+          ".control-item:hover"
+        );
+        if (this.isFullscreen && isHoverOverControlItem) {
+          return;
+        }
+        this.controls.removeAttribute("showing");
+
+        if (
+          !this.isFullscreen &&
+          !this.isCurrentHover &&
+          !this.controls.getAttribute("keying") &&
+          !this.controls.getAttribute("donthide")
+        ) {
+          this.actor.sendAsyncMessage("PictureInPicture:HideVideoControls", {
+            isFullscreen: false,
+            isVideoControlsShowing: false,
+            playerBottomControlsDOMRect: null,
+          });
+        }
+      }, CONTROLS_FADE_TIMEOUT_MS);
+    }
+  },
+
+  /**
+   * Given a width and height for a video, computes the minimum dimensions for
+   * the player window, and then sets them on the root element.
+   *
+   * This is currently only used on Linux GTK, where the OS doesn't already
+   * impose a minimum window size. For other platforms, this function is a
+   * no-op.
+   *
+   * @param {Number} width
+   *   The width of the video being played.
+   * @param {Number} height
+   *   The height of the video being played.
+   */
+  computeAndSetMinimumSize(width, height) {
+    if (!AppConstants.MOZ_WIDGET_GTK) {
+      return;
+    }
+
+    // Using inspection, these seem to be the right minimums for each dimension
+    // so that the controls don't get too crowded.
+    const MIN_WIDTH = 120;
+    const MIN_HEIGHT = 80;
+
+    let resultWidth = width;
+    let resultHeight = height;
+    let aspectRatio = width / height;
+
+    // Take the smaller of the two dimensions, and set it to the minimum.
+    // Then calculate the other dimension using the aspect ratio to get
+    // both minimums.
+    if (width < height) {
+      resultWidth = MIN_WIDTH;
+      resultHeight = Math.round(MIN_WIDTH / aspectRatio);
+    } else {
+      resultHeight = MIN_HEIGHT;
+      resultWidth = Math.round(MIN_HEIGHT * aspectRatio);
+    }
+
+    document.documentElement.style.minWidth = resultWidth + "px";
+    document.documentElement.style.minHeight = resultHeight + "px";
+  },
+};
diff --git a/toolkit/components/pictureinpicture/content/player.xhtml b/toolkit/components/pictureinpicture/content/player.xhtml
new file mode 100644
index 0000000000..82e4c8a0c7
--- /dev/null
+++ b/toolkit/components/pictureinpicture/content/player.xhtml
@@ -0,0 +1,117 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<html xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+      windowtype="Toolkit:PictureInPicture"
+      chromemargin="0,0,0,0"
+      >
+  <head>
+    <meta charset="utf-8"/>
+    <link rel="stylesheet" href="chrome://global/skin/pictureinpicture/player.css"/>
+    <link rel="localization" href="toolkit/pictureinpicture/pictureinpicture.ftl"/>
+    <link rel="localization" href="browser/browserSets.ftl"/>
+    <script src="chrome://global/content/pictureinpicture/player.js"></script>
+    <title data-l10n-id="pictureinpicture-player-title"></title>
+  </head>
+
+  <body>
+    <xul:commandset>
+      <xul:command id="View:PictureInPicture" oncommand="Player.onCommand(event);"/>
+      <xul:command id="View:Fullscreen" oncommand="Player.fullscreenModeToggle(event);"/>
+    </xul:commandset>
+
+    <xul:keyset>
+      <xul:key id="closeShortcut" key="W" modifiers="accel"/>
+      <xul:key id="muteShortcut" key="↓" modifiers="accel"/>
+      <xul:key id="unMuteShortcut" key="↑" modifiers="accel"/>
+#ifndef XP_MACOSX
+      <xul:key data-l10n-id="picture-in-picture-toggle-shortcut" command="View:PictureInPicture" modifiers="accel,shift"/>
+      <xul:key data-l10n-id="picture-in-picture-toggle-shortcut-alt" command="View:PictureInPicture" modifiers="accel,shift"/>
+#else
+      <xul:key data-l10n-id="picture-in-picture-toggle-shortcut-mac" command="View:PictureInPicture" modifiers="accel,alt,shift"/>
+      <xul:key data-l10n-id="picture-in-picture-toggle-shortcut-mac-alt" command="View:PictureInPicture" modifiers="accel,alt,shift"/>
+#endif
+      <xul:key id="fullscreenToggleShortcut" data-l10n-id="pictureinpicture-toggle-fullscreen-shortcut" command="View:Fullscreen"/>
+    </xul:keyset>
+
+    <div class="player-holder">
+      <xul:browser type="content" primary="true" remote="true" remoteType="web" id="browser" tabindex="-1"></xul:browser>
+    </div>
+    <div id="controls" dir="ltr">
+      <button id="close"
+      class="control-item control-button tooltip-under-controls" data-l10n-attrs="tooltip"
+#ifdef XP_MACOSX
+      mac="true"
+      tabindex="8"
+#else
+      tabindex="9"
+#endif
+      />
+      <button id="unpip"
+      class="control-item control-button tooltip-under-controls" data-l10n-id="pictureinpicture-unpip-btn" data-l10n-attrs="tooltip"
+#ifdef XP_MACOSX
+      mac="true"
+      tabindex="9"
+#else
+      tabindex="8"
+#endif
+      />
+    <div id="controls-bottom-gradient" class="control-item"></div>
+    <div id="controls-bottom">
+      <div class="controls-bottom-upper">
+          <div class="scrubber-no-drag">
+            <input id="scrubber" class="control-item" min="0" max="1" step=".001" type="range" tabindex="10" hidden="true"/>
+          </div>
+      </div>
+      <div class="controls-bottom-lower">
+        <div class="start-controls">
+          <div id="timestamp" class="control-item" hidden="true"></div>
+        </div>
+        <div class="center-controls">
+          <button id="seekBackward" class="control-item control-button tooltip-over-controls center-tooltip" hidden="true" data-l10n-id="pictureinpicture-seekbackward-btn" data-l10n-attrs="tooltip" tabindex="11"></button>
+          <button id="playpause" class="control-item control-button tooltip-over-controls center-tooltip" tabindex="1"
+                  data-l10n-id="pictureinpicture-pause-btn" data-l10n-attrs="tooltip"/>
+          <button id="seekForward" class="control-item control-button tooltip-over-controls center-tooltip" hidden="true" data-l10n-id="pictureinpicture-seekforward-btn" data-l10n-attrs="tooltip" tabindex="2"></button>
+        </div>
+        <div class="end-controls">
+          <button id="audio" class="control-item control-button tooltip-over-controls center-tooltip" hidden="true" data-l10n-attrs="tooltip" tabindex="3"/>
+          <button id="closed-caption" class="control-item control-button tooltip-over-controls center-tooltip closed-caption" hidden="true" disabled="true" data-l10n-id="pictureinpicture-subtitles-btn" data-l10n-attrs="tooltip" tabindex="4"></button>
+          <div id="settings" class="hide panel">
+            <fieldset class="box panel-fieldset">
+              <legend class="a11y-only panel-legend" data-l10n-id="pictureinpicture-subtitles-panel-accessible"></legend>
+              <div class="subtitle-grid">
+                <label id="subtitles-toggle-label" data-l10n-id="pictureinpicture-subtitles-label" class="bold" for="subtitles-toggle"></label>
+                <label class="switch">
+                  <input id="subtitles-toggle" type="checkbox" tabindex="5" checked=""/>
+                  <span class="slider" role="presentation"></span>
+                </label>
+              </div>
+              <div class="grey-line"></div>
+              <fieldset class="font-size-selection panel-fieldset">
+                <legend data-l10n-id="pictureinpicture-font-size-label" class="bold panel-legend"></legend>
+                <div id="font-size-selection-radio-small" class="font-size-selection-radio">
+                  <input id="small" type="radio" name="cc-size" tabindex="6"/>
+                  <label data-l10n-id="pictureinpicture-font-size-small" for="small"></label>
+                </div>
+                <div id="font-size-selection-radio-medium" class="font-size-selection-radio">
+                  <input id="medium" type="radio" name="cc-size" tabindex="6"/>
+                  <label data-l10n-id="pictureinpicture-font-size-medium" for="medium"></label>
+                </div>
+                <div id="font-size-selection-radio-large" class="font-size-selection-radio">
+                  <input id="large" type="radio" name="cc-size" tabindex="6"/>
+                  <label data-l10n-id="pictureinpicture-font-size-large" for="large"></label>
+                </div>
+              </fieldset>
+            </fieldset>
+            <div class="arrow"></div>
+          </div>
+          <button id="fullscreen" class="control-item control-button tooltip-over-controls inline-end-tooltip" hidden="true" data-l10n-attrs="tooltip" tabindex="7"></button>
+        </div>
+      </div>
+    </div>
+  </div>
+  </body>
+</html>