[css-shape-1] Support path/shape basic-shape-function inside `shape-outside` property

[CGQAQ]

Put it into interop 2026

Test List

https://wpt.fyi/results/css/css-shapes/parsing/shape-outside-computed.html

https://wpt.fyi/results/css/css-shapes/shape-outside/supported-shapes/shape/shape-outside-shape-000.html
https://wpt.fyi/results/css/css-shapes/shape-outside/supported-shapes/shape/shape-outside-shape-001.html
https://wpt.fyi/results/css/css-shapes/shape-outside/supported-shapes/shape/shape-outside-shape-002.html
https://wpt.fyi/results/css/css-shapes/shape-outside/supported-shapes/shape/shape-outside-shape-003.html

https://wpt.fyi/results/css/css-shapes/shape-outside/supported-shapes/path/shape-outside-path-000.html
https://wpt.fyi/results/css/css-shapes/shape-outside/supported-shapes/path/shape-outside-path-001.html
https://wpt.fyi/results/css/css-shapes/shape-outside/supported-shapes/path/shape-outside-path-002.html
https://wpt.fyi/results/css/css-shapes/shape-outside/supported-shapes/path/shape-outside-path-003.html

https://wpt.fyi/results/css/css-shapes/animation/shape-outside-path-interpolation.html
https://wpt.fyi/results/css/css-shapes/animation/shape-outside-shape-interpolation.html

Rationale

shape-outside's value is defined as none | [ <basic-shape> || <shape-box> ] | <image>, and according to the spec, path and shape functions are in the basic-shape list.

[CGQAQ]

Seems like a wrong place to file this issue, but don't know a better place, reopen...

[yulunwu2]

LGTM from webkit.

[jgraham]

@BorisChiou any opinion on adding these tests?

[BorisChiou]

Gecko doesn't support shape-outside:shape() and shape-outside:path(). Only for clip-path and offset-path. I probably need to discuss with others since this may need some extra work.