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<!DOCTYPE html> <html> <body> <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"); ctx.fillStyle = "red"; ctx.fillRect(10, 10, 50, 50); function copy() { var imgData = ctx.getImageData(10, 10, 50, 50); ctx.putImageData(imgData, 10, 70); } </script> <button onclick="copy()">Copy</button> </body> </html>