For WebGL content, WebKit needs to perform MSAA resolve on the WebGL buffer before compositing via a blit. On Apple platforms, this draw buffer is usually in BGRA8_SRGB_ANGLEX as it is the native format for the windowing system's compositor, so SRGB8_ALPHA8 needs coercion for WebGL to work with multisample sRGB content.
<rdar://problem/110811770>
Pull request: https://github.com/WebKit/WebKit/pull/14984
Committed 265219@main (e05b9c978c96): <https://commits.webkit.org/265219@main> Reviewed commits have been landed. Closing PR #14984 and removing active labels.