【多选题】【消耗次数：1】
HTML5支持的视频格式有（ ）
①
ogg
②
Mp4
③
Flv
④
WebM
参考答案：
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①
!DOCTYPE html
②
!DOCTYPE HTML5
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!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 5.0//EN http://www.w3.org/TR/htm15/strict.dtd
④
!DOCTYPE htm15
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