docker/docker PR 22873 solves backspace issue

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Append ?t=30 to start the playback at 30s, ?t=3:20 to start the playback at 3m 20s.

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asciinema play 46305.json

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<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" type="text/css" href="asciinema-player.css" />
</head>
<body>
  <div id="player"></div>
  <script src="asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/46305.json',
      document.getElementById('player'),
      { cols: 80, rows: 24 }
    );
  </script>
</body>
</html>

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While this site doesn't provide GIF conversion at the moment, you can still do it yourself with the help of asciinema GIF generator utility - agg.

Once you have it installed, generate a GIF with the following command:

agg https://asciinema.org/a/46305 demo.gif

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agg demo.cast demo.gif

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See agg manual for full usage instructions.