Why doesn't webm work on Android via HTML5 player?

Question

HTML

Good afternoon. I transferred the gif to webm for a regular HTML5 player (through the video tag, without third-party solutions) using ffmpeg. On the desktop everything works fine, but if I open the page on Android, the video does not play! The problem is in webm, because. mp4 I tried it works fine on a smartphone. If I download the same file on my smartphone and open it there using VLC, then everything is also OK, the file works.
Total: webm does not work exactly on a smartphone through a web browser. Why, how to fix? Link to file https://www.dropbox.com/s/f8ffmz1scbkxkzi/wtf.webm?dl=0
And code

<video @click="playPause" muted controls loop autoplay poster="222.jpeg" class="viewer">
      <source src="wtf.webm#t=0.1" type="video/webm">
      <source src="wtf.mp4#t=0.1" type="video/mp4">
      Sorry, your browser doesn't support HTML5 video, but you can <a href="videofile.webm">download it</a> and watch it with your favorite video player!
    </video>

Answer 1

depends on what version of android you have Can i use