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<!DOCTYPE html> <html> <body> <p>The three different line caps:</p> <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.beginPath(); ctx.lineWidth = 10; ctx.lineCap = "butt"; ctx.moveTo(20, 20); ctx.lineTo(200, 20); ctx.stroke(); ctx.beginPath(); ctx.lineCap = "round"; ctx.moveTo(20, 40); ctx.lineTo(200, 40); ctx.stroke(); ctx.beginPath(); ctx.lineCap = "square"; ctx.moveTo(20, 60); ctx.lineTo(200, 60); ctx.stroke(); </script> </body> </html>