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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> let c = document.getElementById("myCanvas"); let ctx = c.getContext("2d"); ctx.fillStyle = "#FF0000"; ctx.fillRect(20, 20, 150, 100); </script> </body> </html>