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Continue to ChatQuery : Minimally, MP4 + either WebM or Ogg, or maybe both. --How many formats do I need for HTML5 video? As far as I'm aware, the situation hasn't changed significantly. And from what I've seen https://vmapp.org/query/80112/Minimally-MP4-Either-WebM-Or-Ogg-Or-Maybe-Both-How-Many-Formats-Do-I-Need-For-HTML5-Video-As-Far-As-I-M-Aware-The-Situation-Hasn-T-Changed-Significantly-And-From-What-I-Ve-Seen/