OffscreenCanvas WebGL Context Limit

[Tarek Sherif]

Hi all,

In some recent tests I did with rendering to an OffscreenCanvas in WebGL, I found I was limited to a maximum of 4 WebGL contexts, compared to the 16 I can get from a standard HTML Canvas on the same machine/browsers (2021 Macbook Pro, M1 Max, Chrome 131 and Safari 18). 

I was just wondering if there's a technical reason for this and whether there's any documentation about it.

Thanks,

Tarek Sherif

Staff Engineer, DataViz Maps

Datadog