webvtt - How to change video subtitles font size in html5? -


my html looks this:

<!doctype html>  <html>     <head>         <meta name="viewport" content="width=device-width">     </head>     <body>         <video controls="" autoplay="" name="media">             <source src="videopath" type="video/mp4">             <track label="english" kind="subtitles" srclang="en" src="subs.vtt" default>         </video>     </body> </html>

as subs.vtt subtitles file.

how change subtitles size attached track element?

i tried creating css file, gave track id , specified font-size in css, , of course linked css html, size didn't change.

i tried styling inside .vtt file itself:

webvtt  1 00:00:43.889 --> 00:00:46.949 size:200% <i>introduction...</i>

and didn't change size.

i tried found online:

webvtt <link href="style.css" rel="stylesheet" type="text/css" /> 1 00:00:43.889 --> 00:00:46.949 <c vintro><i>introduction...</i></c>

and in css:

.vintro{   font-size: 5em; }

but didn't change size.

i prefer way without touching .vtt file.

in browsers support shadow dom, can style subtitles. may vary browser browser, in chrome 42 (current of writing), can use css:

video::-webkit-media-text-track-display {   font-size: 200%; }

given there's vendor prefix in there, imagine other browsers might require additional rules. again, there aren't many browsers support shadow dom. of writing, it's chrome, opera, , android/chrome-for-android.


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