1 files changed, 74 insertions, 0 deletions
diff --git a/toolkit/themes/shared/pictureinpicture/texttracks.css b/toolkit/themes/shared/pictureinpicture/texttracks.css
new file mode 100644
index 0000000000..ec7af4a7b4
--- /dev/null
+++ b/toolkit/themes/shared/pictureinpicture/texttracks.css
@@ -0,0 +1,74 @@
+/* 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;
+    }
+}