some browser supports some video's format here is some cases◀🌎▶

Question

(INTERNET EXPLORER) is supported "MP4", but not "OGG" and "WEBM" format

(GOOGLE CHROME) is supported "MP4", "WEBM" and "OGG"

(FIREFOX) is supported "WEBM", "OGG" before was not supported "MP4" but since FIREFOX 21 is supported "MP4"

(SAFARI) is supported "MP4" ONLY BUT NOT SUPPORTED "OGG" and "WEBM"

(OPERA) is supported "WEBM", "OGG" BUT NOT SUPPORTED "MP4"

Answer 1

The video element is capable of so much more if you read the API documentation on the W3C standards website. Things like subtitles are really interesting.