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HTML

              
                <main role="main">
  <h1>Cherry Blossoms in Japanese Culture – <a href="https://www.loc.gov/item/webcast-9721/">Source</a></h1>
  <input type="checkbox" id="a11y-toggle"><label for="a11y-toggle">Toggle Mac & iOS accessibility cue style issue.</label>
  <video controls crossorigin="crossorigin" preload="metadata" poster="https://tile.loc.gov/storage-services/media/webcasts/2021/210111pnp1000/data/210111pnp1000-1280x720_2000_bg.jpg" src="https://chrislachance.com/wp-content/uploads/sakura-clip_compressed.mp4" data-OLD-src="https://tile.loc.gov/storage-services/media/webcasts/2021/210111pnp1000/data/210111pnp1000-1280x720_2000.mp4">
    <!--track kind="captions"  src="https://tile.loc.gov/streaming-services/iiif/media:webcasts:2021:210111pnp1000:data:210111pnp1000-1280x720_2000/full/full/0/full/default.vtt" label="US English" srclang="en"-->
<track kind="captions" src="https://chrislachance.com/wp-content/uploads/sakura_us-englis.vtt"  label="English" srclang="en">
    <track kind="captions" src="https://chrislachance.com/wp-content/uploads/sakura_internal.vtt"  label="Internal style test" srclang="en-gb">
    <track kind="captions" src="https://chrislachance.com/wp-content/uploads/sakura_external.vtt" label="External CSS style test" srclang="en-uk">
    <track kind="captions"  src="https://chrislachance.com/wp-content/uploads/sakura_safari-bug.vtt" label="MacOS Safari position bug" srclang="en-us">
    <track kind="captions"  src="https://chrislachance.com/wp-content/uploads/sakura_safari-bug.vtt" label="Safari won't see this track" srclang="en-us">
    <track kind="captions" default src="https://chrislachance.com/wp-content/uploads/sakura_chromium-bug.vtt" label="Chromium position bug" srclang="en-ca">
    <track kind="captions" default src="https://chrislachance.com/wp-content/uploads/sakura_position-align-bug.vtt" label="Non-Safari position align bug" srclang="en-as">
  </video>
</main>
              
            
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CSS

              
                :root{
	--font-default:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;
	--font-brand:serif;
	--font-scale:1.23;
	--color-base:#ddd;
	--color-link:#1056E6;
	--color-background:#242222;
	--color-divider:rgba(61,73,81,.15);
	--content-density-s:2.5ex;
	--content-density-m:3.3ex;
	--content-density-l:4.4ex;
	--border-radius:.5rem;	
	--space:6rem;
	--touch-height:2.75rem; /* ~44px */
	--shadow-m:0 .5ch .75rem rgba(0,0,0,.3);
	--shadow-s:0 .25ch .5rem rgba(0,0,0,.1);
	--max-width:60ch;
	--ease:cubic-bezier(.4,.6,.1,1);
	--time-s:.2s;
	
	background-color: var(--color-background);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 56 28' width='56' height='28'%3E%3Cpath fill='%23fff' fill-opacity='0.025' d='M56 26v2h-7.75c2.3-1.27 4.94-2 7.75-2zm-26 2a2 2 0 1 0-4 0h-4.09A25.98 25.98 0 0 0 0 16v-2c.67 0 1.34.02 2 .07V14a2 2 0 0 0-2-2v-2a4 4 0 0 1 3.98 3.6 28.09 28.09 0 0 1 2.8-3.86A8 8 0 0 0 0 6V4a9.99 9.99 0 0 1 8.17 4.23c.94-.95 1.96-1.83 3.03-2.63A13.98 13.98 0 0 0 0 0h7.75c2 1.1 3.73 2.63 5.1 4.45 1.12-.72 2.3-1.37 3.53-1.93A20.1 20.1 0 0 0 14.28 0h2.7c.45.56.88 1.14 1.29 1.74 1.3-.48 2.63-.87 4-1.15-.11-.2-.23-.4-.36-.59H26v.07a28.4 28.4 0 0 1 4 0V0h4.09l-.37.59c1.38.28 2.72.67 4.01 1.15.4-.6.84-1.18 1.3-1.74h2.69a20.1 20.1 0 0 0-2.1 2.52c1.23.56 2.41 1.2 3.54 1.93A16.08 16.08 0 0 1 48.25 0H56c-4.58 0-8.65 2.2-11.2 5.6 1.07.8 2.09 1.68 3.03 2.63A9.99 9.99 0 0 1 56 4v2a8 8 0 0 0-6.77 3.74c1.03 1.2 1.97 2.5 2.79 3.86A4 4 0 0 1 56 10v2a2 2 0 0 0-2 2.07 28.4 28.4 0 0 1 2-.07v2c-9.2 0-17.3 4.78-21.91 12H30zM7.75 28H0v-2c2.81 0 5.46.73 7.75 2zM56 20v2c-5.6 0-10.65 2.3-14.28 6h-2.7c4.04-4.89 10.15-8 16.98-8zm-39.03 8h-2.69C10.65 24.3 5.6 22 0 22v-2c6.83 0 12.94 3.11 16.97 8zm15.01-.4a28.09 28.09 0 0 1 2.8-3.86 8 8 0 0 0-13.55 0c1.03 1.2 1.97 2.5 2.79 3.86a4 4 0 0 1 7.96 0zm14.29-11.86c1.3-.48 2.63-.87 4-1.15a25.99 25.99 0 0 0-44.55 0c1.38.28 2.72.67 4.01 1.15a21.98 21.98 0 0 1 36.54 0zm-5.43 2.71c1.13-.72 2.3-1.37 3.54-1.93a19.98 19.98 0 0 0-32.76 0c1.23.56 2.41 1.2 3.54 1.93a15.98 15.98 0 0 1 25.68 0zm-4.67 3.78c.94-.95 1.96-1.83 3.03-2.63a13.98 13.98 0 0 0-22.4 0c1.07.8 2.09 1.68 3.03 2.63a9.99 9.99 0 0 1 16.34 0z'%3E%3C/path%3E%3C/svg%3E");
	color: var(--color-base);
}
:root/*,::cue*/{
  font-family:var(--font-default);
  // font-family:monospace;
  line-height:var(--content-density-m);
}
body{
  min-height:100vh;
  display:flex;
  align-items: center;
  justify-content: center;
}
main{
  width:var(--max-width);
  padding:0 2ch;
}
h1{
  margin-bottom:1.5ex;
  font-size:150%;
  font-weight:700;
  text-shadow:0 -.1rem .1rem #0006;
  text-align:center;
  a{color:inherit}
  a:hover,a:focus{text-decoration:underline}
}
video{
  width:100%;
  border-radius:1rem;
  box-shadow:0 2rem 6rem #0009,0 .5rem 2rem #000b;
}
input+label{display:inline-block;padding-inline-start:.5em;margin-block-end:2em}

// Caption styling
input:checked~video::cue{
  color:black;
  background:white;
}
video::cue(#id-test){
  color:red !important;
  background:blue;
}
video::cue(c){
  color:purple;
  background:orange;
}
video::cue(c.class-test){
  color:green !important;
  background:yellow;
}
video::cue-region(#reg-test) {
  color: pink !important;
  background:grey;
}
              
            
!

JS

              
                
              
            
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