What is wrong?

WebGL kernel feature checks may throw an error

Where does it happen?

In WebGLKernel.setupFeatureChecks when trying to check if WebGL 1 kernel is supported

How do we replicate the issue?

prerequisite:

• global variable document must be undefined

• OffscreenCanvas class should be define

• offsetCanvas.getContext('webgl') should not be truthly

• compute GPU.isWebGLSupported

• then, offsetCanvas.getContext('experimental-webgl') will throw an error

In Chrome you can directly test this case in console:

How important is this (1-5)?

2

Expected behavior (i.e. solution)

WebGLKernel.setupFeatureChecks should return without throwing exception.

testCanvas.getContext('experimental-webgl') should not be called on OffscreenCanvas

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