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htmlwidget with media elements not working in WebView

See original GitHub issue

Some htmlwidgets might contain multimedia elements. They are currently not working properly in WebView.

For example, {gm} can be used to generate music scores and playable audio with the following demo code:

library(gm)

m <- 
  # initialize a Music object
  Music() +
  # add a 4/4 time signature
  Meter(4, 4) +
  # add a musical line of four quarter notes
  Line(list("C5", "D5", "E5", "F5"), list(1, 1, 1, 1))

show(m, to = c("score", "audio"))

Its HTML is simple:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<div>
  <p>
    <img src="file12eef7447e4b9.png" style="max-width: 100%;"/>
  </p>
  <p>
    <audio controls>
      <source src="file12eef7447e4b9.mp3" type="audio/mp3"/>
    </audio>
  </p>
</div>
</body>
</html>

From the developer tools, the URIs seems to be correctly replaced with vscode-resource scheme but still not working.