Webm is not allowed:
.
[test link](https://example.com/file.webm)
.
<p><a href="https://example.com/file.webm">test link</a></p>
.

MP3 is allowed
.
[](https://example.com/file.mp3)
.
<p><audio controls preload="metadata">
<source type="audio/mpeg" src="https://example.com/file.mp3"></source>
Your browser does not support playing HTML5 audio. You can <a href="https://example.com/file.mp3" download>download a copy of the audio file</a> instead.
</audio></p>
.

OGV is allowed
.
[test link](https://example.com/file.ogv)
.
<p><video controls preload="metadata">
<source type="video/ogg" src="https://example.com/file.ogv"></source>
Your browser does not support playing HTML5 video. You can <a href="https://example.com/file.ogv" download>download a copy of the video file</a> instead.
Here is a description of the content: test link
</video></p>
.

Non-media link
.
[test link](https://example.com/file.php)
.
<p><a href="https://example.com/file.php">test link</a></p>
.
