Intent to Ship: OffscreenCanvas getContextAttributes

[ccameron chromium]

Contact emails
ccam...@chromium.org

Explainer
https://github.com/ccameron-chromium/ColorWeb-CG/blob/canvas_cleanup/canvas2d_settings.md

Specification
https://github.com/whatwg/html/pull/10904

Summary
Add the getContextAttributes interface from CanvasRenderingContext2D to OffscreenCanvasRenderingContext2D. Its omission from CanvasRenderingContext2D was accidental.

Add support for willReadFrequently and desynchronized to OffscreenCanvasRenderingContext2D in the HTML spec. The spec changes for those features were intended to apply both to CanvasRenderingContext2D and to OffscreenCanvasRenderingContext2D. Blink has already shipped support for these.

Clean up the text of the spec to avoid these sorts of mistakes in the future, and to streamline future changes.

Blink component
Blink>Canvas

TAG review
https://github.com/w3ctag/design-reviews/issues/1036

TAG review status
Pending

Risks

Interoperability and Compatibility
None

Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1159)

WebKit: No official signal yet, informal positive (https://github.com/WebKit/standards-positions/issues/445)

Web developers: No signals, but does align the spec with longstanding feature requests (e.g, https://github.com/whatwg/html/issues/2659)

Other signals:

WebView application risks
Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?
None

Debuggability
None

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
Yes

Is this feature fully tested by web-platform-tests?
Yes, pending https://chromium-review.googlesource.com/c/chromium/src/+/6157844

Flag name on about://flags
None

Finch feature name
OffscreenCanvasGetContextAttributes

Non-finch justification
N/A

Requires code in //chrome?
False

Tracking bug
https://crbug.com/388437261

Estimated milestones
No milestones specified

Anticipated spec changes
The altered spec text will be further modified soon to add support for float16 canvas and HDR canvas. Adding new features without cleaning this up would have been irresponsible.

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5508068999430144?gate=5254553451364352

Links to previous Intent discussions
Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGnfxj_NMVg9vW0gsRhJ_rPW%3Dhb4C_UKPNd1LXdsUrRhebKj4Q%40mail.gmail.com

[Yoav Weiss (@Shopify)]

LGTM1

[Daniel Bratell]

LGTM2

/Daniel

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[Vladimir Levin]

LGTM3

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