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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.font="30px Arial"; var txt="Hello World" ctx.fillText("width:" + ctx.measureText(txt).width,10,50); ctx.fillText(txt,10,100); </script> </body> </html>