Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

HTML Canvas measure text width difference

  • 1 reply
  • 1 has this problem
  • 10 views
  • Last reply by cor-el

more options

HTML Canvas measure text width value is different from other browsers for Courier New font family.

Please find the width value comparison of the browsers. Google Chrome width: 19.203125 Firefox width: 20 Internet Explorer: 19 Edge: 19.203125

Sample Code:

<!DOCTYPE html>
<html>
<body>
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"></canvas>
<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "8px courier new";
var txt = "Code"
ctx.fillText("width:" + ctx.measureText(txt).width, 10, 50);
ctx.fillText(txt, 10, 100);
</script>
</body>
</html>
HTML Canvas measure text width value is different from other browsers for Courier New font family. Please find the width value comparison of the browsers. Google Chrome width: 19.203125 Firefox width: 20 Internet Explorer: 19 Edge: 19.203125 Sample Code: <pre><nowiki><!DOCTYPE html> <html> <body> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"></canvas> <script> var c = document.getElementById("myCanvas"); var ctx = c.getContext("2d"); ctx.font = "8px courier new"; var txt = "Code" ctx.fillText("width:" + ctx.measureText(txt).width, 10, 50); ctx.fillText(txt, 10, 100); </script> </body> </html></nowiki></pre>

Modified by cor-el

All Replies (1)

more options

Maybe ask advice at a web development oriented forum.