CSS Shapes: vertex rounding for polygon() #1197

Specification title

CSS Shapes

Specification or proposal URL (if available)

https://drafts.csswg.org/css-shapes/#supported-basic-shapes

Explainer URL (if available)

No response

Proposal author(s)

No response

MDN URL

No response

Caniuse.com URL

No response

Bugzilla URL

No response

Mozillians who can provide input

No response

WebKit standards-position

WebKit/standards-positions#474

Other information

There is a wide variety of use cases where authors want to clip or mask an element based on a shape that is basically a simple polygon plus rounding. Right now this is exceedingly complicated to do by hand (since you'd need to use path()), and practically impossible to do with the same flexibility of units that polygon() supports.

w3c/csswg-drafts#9843