<!DOCTYPE HTML> <title>Test for clipping of border-radius</title> <style> canvas { margin: 18px 19px 21px 25px; /* border + padding: 1px 2px 4px 8px */ /* Horizontal: TL TR BR BL / Vertical: TL TR BR BL */ /* border-radius: 25px 17px 14px 18px / 12px 15px 18px 17px; */ border-radius: 17px 15px 12px 10px / 11px 14px 14px 13px; } </style> <canvas id="canvas" height="100" width="200"></canvas> <script> var canvas = document.getElementById("canvas"); var cx = canvas.getContext("2d"); cx.fillStyle="lime"; cx.fillRect(0, 0, 200, 100); </script>