Beginning 2015 YouTube announced it would switch to HTML5 video by default.
This will work in browsers that support the h264 or WebM video codecs, most
modern browser should work. Browsers that don't support those codecs will, upon
playing, fall back to Flash.
This will work in browsers that support the h264 or WebM video codecs, most
modern browser should work. Browsers that don't support those codecs will, upon
playing, fall back to Flash.