The best replacement for webm is mp4.

The best alternatives to webm are rated as following:
★★★★★  mp4
★★★  h 264
★★★  flv
★★★  ogg
★★  ogv
★★  mkv
★★  h.264
★  theora
★  gif
★  webp
★  hls
  mp4 quality
  h 265
  mp4 youtube
  h264
  flv better

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Google Trends

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webm
mp4
h 264