![css-backgrounds-4] Extruding border corners (negative border-radius) · Issue #2811 · w3c/csswg-drafts · GitHub css-backgrounds-4] Extruding border corners (negative border-radius) · Issue #2811 · w3c/csswg-drafts · GitHub](https://user-images.githubusercontent.com/34976212/41810754-dbfa3620-7703-11e8-84e5-193d02bae2db.png)
css-backgrounds-4] Extruding border corners (negative border-radius) · Issue #2811 · w3c/csswg-drafts · GitHub
![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) 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)](http://terrainformatica.com/w3/css4-ext-borders.png)
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)
![How to make a curved banner border in CSS - HTML & CSS - SitePoint Forums | Web Development & Design Community How to make a curved banner border in CSS - HTML & CSS - SitePoint Forums | Web Development & Design Community](https://aws1.discourse-cdn.com/sitepoint/optimized/3X/d/3/d33292444dd7d69ed64201b73af21a7d740ff32f_2_690x388.png)