Transparency doesn't work with the Phaser game framework test page

I have an issue with transparency when testing the Phaser game framework on the browser.
I made a short video to show the issue. You can view it here.

You can reproduce by creating a file index.html as explained here.

The issue present even when the Brave Shield is turned off.

Thanks for your help.

Best regards,

Fedora 31
Brave Browser [Version 1.7.92 Chromium: 80.0.3987.163 (Official Build) (64-bit)]

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