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<!DOCTYPE html> <html> <body> <span>Without clip():</span> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag.</canvas> <script> var c = document.getElementById("myCanvas"); var ctx = c.getContext("2d"); // Draw a rectangle ctx.rect(50, 20, 200, 120); ctx.stroke(); // Draw red rectangle ctx.fillStyle = "red"; ctx.fillRect(0, 0, 150, 100); </script> <span>With clip():</span> <canvas id="myCanvas2" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag.</canvas> <script> var c = document.getElementById("myCanvas2"); var ctx = c.getContext("2d"); // Clip a rectangular area ctx.rect(50, 20, 200, 120); ctx.stroke(); ctx.clip(); // Draw red rectangle after clip() ctx.fillStyle = "red"; ctx.fillRect(0, 0, 150, 100); </script> </body> </html>