Description

The Color Spaces and Functions focus area was great in 2022 for improving interop around wide color gamuts. But one path for better support was missed, because there are no WPT tests for WebGL Canvas color spaces. Apparently there are some tests for this in the Khronos WebGL conformance tests.

So I propose to enhance the Color Spaces and Functions focus area for 2023 with some Khronos WebGL tests, if we can figure out a way to pull or generate test results from them.

Rationale

Wide color gamut support in WebGL Canvas is necessary for performant color management in apps like Photoshop on the web. We currently work around the lack by creating multiple Canvases which gets very memory-intensive.

Specification

https://registry.khronos.org/webgl/specs/latest/1.0/#DOM-WebGLRenderingContext-drawingBufferColorSpace

Tests

@ccameron-chromium likely has a good idea of what is covered there (and what tests could be added).