I use OBS (open broadcaster studio https://obsproject.com/) and similar products to record and stream footage when i’m working on mapping preparations for various Virtual Table Top groups. Chrome and Brave seem to handle the HTML5 canvas for the creation tools I use (http://roll20.net). My guess is due to the hardware acceleration in them.
How ever when I need to capture the process for what ever reason. I have to switch over to use firefox. As only it will properly capture with out having to record/capture my entire screen. When you try and capture the brave window. You get only a blank output.
I’m hoping someone can look at the code for either and see what might be able to be done to support the capture process.