css-background-4] Replace `corner-shape` with property that just does angled corners + rounding · Issue #8591 · w3c/csswg-drafts · GitHub
Understanding Clip Path in CSS - Ahmad Shadeed
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Re: Idea : replacement for border-radius, a more complete corner styling property. from Andrew Fedoniouk on 2011-09-01 (www-style@w3.org from September 2011)