As of Firefox 117, I intend to implement the getContextAttributes()
method of the CanvasRenderingContext2D interface.
getContextAttributes allows content to query the attributes that were
set when creating a CanvasRenderingContext2D; this may be needed because
just calling getContext("2d", [options]) on a <canvas> will return a
pre-existing context for the canvas element, if there is one, even if it
was created with different options. So a script that cares about the
options may want to verify what it got back from getContext().
Supported in both Blink and WebKit.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1517786
Standard: https://html.spec.whatwg.org/multipage/canvas.html#2dcontext
Testing:
https://wpt.fyi/results/html/canvas/element/manual/context-attributes/getContextAttributes.html
Platform coverage: All
Restricted to secure contexts: No; the entire CanvasRenderingContext2D
interface is not restricted.
Target Release: 117
Preferences behind which this will be implemented: none
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