toolkit/themes/shared/pictureinpicture/texttracks.css

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/* 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/. */

:root {
  --min-font-size: 14px;
  --max-font-size: 40px;
  --font-scale: 0.06;
  --texttracks-bottom: calc(var(--font-scale) * 100vh);

  /*
     * Move text tracks if they visually overlap with pip player controls
     * New text tracks position is determined by adding together:
     *  1) bottom distance of #controls
     *  2) height of #controls-bottom,
     *  3) border size of player controls buttons
     *  4) hardcoded px value (to ensure consistent distance, regardless of pip window size)
     * NOTE: if changing player.css values, change values here too.
     */
  --resize-margin: 5px;
  --player-controls-height: calc(100vh - 2 * var(--resize-margin));
  --player-controls-bottom-distance: calc(100vh - var(--player-controls-height));
  --player-controls-button-height: 10vmax;
  --player-controls-button-max-height: 32px;
  --player-controls-button-min-height: 16px;
  --player-controls-button-outline-width: 2px;
  --player-controls-scrubber-height: 0px;
  --player-bottom-controls-height: calc(
    var(--player-controls-scrubber-height) +
      clamp(var(--player-controls-button-min-height), var(--player-controls-button-height), var(--player-controls-button-max-height))
  );
  --distance-from-player-controls: 20px;
  --texttracks-bottom-overlapped: calc(
    var(--player-controls-button-outline-width) + var(--player-controls-bottom-distance) + var(--player-bottom-controls-height) +
      var(--distance-from-player-controls)
  );
}

#texttracks {
  background-color: black;
  opacity: 80%;
  position: absolute;
  text-align: center;
  box-sizing: border-box;
  color: white;
  margin: 0;
  display: block;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px;
  max-width: calc(0.88 * 100vw);
  bottom: var(--texttracks-bottom);
  font-size: clamp(var(--min-font-size), calc(var(--font-scale) * 100vh), var(--max-font-size));
  line-height: clamp(14.4px, calc(var(--font-scale) * 1.2 * 100vh), 48px);
  white-space: pre-line;
  width: max-content;
  font-family: sans-serif;
  transition: bottom 0.3s;
  transition-delay: 0.1s;
}

#texttracks[overlap-video-controls] {
  bottom: var(--texttracks-bottom-overlapped);
}

#texttracks:empty {
  visibility: hidden;
}

@media (prefers-reduced-motion) {
  #texttracks {
    transition: none;
  }
}

@media screen and (max-width: 319px) {
  #texttracks {
    display: none;
  }
}

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