HTML5 Video Formats
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The information below comes from: W3Schools.com.
Currently, there are 3 supported “video formats” for the HTML5 “video” tag: .mp4, .webm, and .ogg.
Internet Explorer supports: .mp4 (Yes), .webm (No), .ogg (No)
Chrome supports: .mp4 (Yes), .webm (Yes), .ogg (Yes)
Firefox supports: .mp4 (No), .webm (Yes), .ogg (Yes)
Safari supports: .mp4 (Yes), .webm (No), .ogg (No)
Opera supports: .mp4 (No), .webm (Yes), .ogg (Yes)
Definitions: .mp4 = MPEG 4 files, with H264 video codec and AAC audio codec
.webm = WebM files, with VP8 video codec and Vorbis audio codec
.ogg = Ogg files, with Theora video codec and Vorbis audio codec.
Note: An Apple company file-name related to the '.mp4' file-format, called [.m4v], is used as a video file-format option for the example video below in addition to the '.mp4' file-format (See: Wikipedia Apple .mp4 version Article); and a video-specific file-name related to the '.ogg' file-format, called [.ogv'], is used as a video file-format option for the example video below in place of the old '.ogg' file-format (See: Wikipedia Ogg formats Article):