The video element below references a .mp4 file served as video/x-m4v using the source element with type video/x-m4v; codecs="avc1.42E01E, mp4a.40.2".
video
.mp4
video/x-m4v
source
video/x-m4v; codecs="avc1.42E01E, mp4a.40.2"
FAIL: This is fallback text.
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