responsive-video-source-selection
Responsive Video Source Selection
Problem
The HTML <source media="..."> attribute inside <video> elements does NOT work
reliably across browsers for responsive video selection. Chrome/Blink and Firefox
ignore the media attribute entirely, always selecting the first <source> that
matches by type. Only Safari/WebKit respects it.
This means code like this only works in Safari:
<!-- BROKEN in Chrome & Firefox -->
<video controls>
<source src="portrait.mp4" type="video/mp4" media="(max-width: 639px)" />
<source src="landscape.mp4" type="video/mp4" />
</video>
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