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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Fill Rectangle Using fillStyle</title> </head> <body> <canvas id="rect_canvas" width="300" height="200" style="border: 2px solid #000">Sorry, Your browser doesn't support Canvas tag!</canvas> <script> window.onload = function() { var rectCnvs = document.getElementById("rect_canvas"); var rectCtx = rectCnvs.getContext("2d"); rectCtx.rect(50, 50, 200, 100); rectCtx.fillStyle = "#00f"; rectCtx.fill(); rectCtx.lineWidth = 4; rectCtx.strokeStyle = "gray"; rectCtx.stroke(); }; </script> </body> </html>