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CSS `corner-shape`

Proposed by web-platform-tests/interop#1368
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corner-shape builds on border-radius to allow more corner shaping options than just round. Options include round, squircle, square, bevel, scoop and notch. A superellipse() function is also available to feather differences between the existing keywords. For example superellipse(-2) allows devs to create an inset squircle shape that does not currently have a keyword.

use case thread: https://github.com/w3c/csswg-drafts/issues/6980
codepen collection (Chrome only for now): https://codepen.io/collection/yyNdaM

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Strict feedback template: Please be as concrete as possible. Specific examples from your production apps or projects provide the highest-value signal to standards editors and browser engineers.
Add your specific real-world use cases, even if they seem obvious to you.
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Are you having to use another feature instead, a polyfill, or is it blocking you completely? Why are the alternatives worse?
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