UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.101 Safari/537.36

Steps to reproduce the problem:
1. Go to www.videomail.io, record and send a video
2. When viewing the video on the view page with the native HTML video player, click on the download button
3. Chrome downloads it and saves it under the name `download` without extension.

What is the expected behavior?
It shouldn't name it as `download` but something better. Probably by respecting the strings in src, the type or by another undocumented HTML attribute.

I really would like to be able to name the video sources separately like `myname.mp4` and `myname.webm` but not have it always `download`

What went wrong?
The <source> tag for listing videos under <video> always names the videos as `download` when you click on the download button.

Did this work before? N/A 

Does this work in other browsers? No
 I guess it's a problem with the HTML specification or is an undocumented feature. It is reproducible on all major browsers

Chrome version: 60.0.3112.101  Channel: n/a
OS Version: OS X 10.12.6
Flash Version: