Make images into a background-image so Firefox -moz-border-radius will work

Firefox -moz-border-radius doesn’t work on images unfortunately. Using -webkit-border-radius however works well on images in Safari and Chrome etc.

A recent customer wanted images on there site to have rounded corners. They where ok with it not working in Internet Explorer 8 and older but really wanted a fix for Firefox. Here follows one solution with jQuery I hacked together. It seems to work ok. The site runs Drupal and the images are displayed in a views block. A simplified version of the HTML looks like this.

<div id="block-views-example-block_1" class="block block-views">
  <div class="content">
    <img src="" class="imagecache" width="200" height="200">

I started out with adding the following CSS rules.

#block-views-example-block_1 img {
  border-radius: 7px;
  -webkit-border-radius: 7px;
  -moz-border-radius: 7px;

This made the corners round and nice in Safari but not in Firefox.

I found out that -moz-border-radius will work on CSS background images. My solution is therefor to move the image from the img tag to a background image on the parent div and setting the width and height of the div to the image size. Below is the jQuery script I came up with.

(function ($) {

// Make border radius work on images in Firefox.
Drupal.behaviors.initFirefoxBackgroundImage = function (context) {
  if ($.browser.mozilla) {
    $('#block-views-example-block_1 img', context).filter(':not(.initFirefoxBackgroundImage-processed)').addClass('initFirefoxBackgroundImage-processed').each(function () {
      var imageUrl = $(this).attr('src');
      var imageWidth = $(this).attr('width');
      var imageHeight = $(this).attr('height');
      $(this).parent().addClass('firefox-radius').css({'background-image' : 'url(' + imageUrl + ')', 'width' : imageWidth, 'height' : imageHeight});


As a last step I added the new “firefox-radius” class to the CSS rules.

#block-views-example-block_1 img,
.firefox-radius {
  border-radius: 7px;
  -webkit-border-radius: 7px;
  -moz-border-radius: 7px;

Not the prettiest solution but it works, it doesn’t mess up things for other browsers and it made the customer happy.


Or you could process the image with ImageCache Actions to achieve round corners / PNG conversion which is compatible in all browsers and doesn’t need a dirty background image hack.

Yes, that is a good option. At least if you are using GD and not ImageMagick as I tend to do.

In the modern age, using images for rounded corners IS a dirty hack.

Seems it’s a little messy, but looks like you made the best of a messy quirk :)

One suggestion though in regards to accessibility, since standards are becoming legislated for certain applications. If I understand correctly, it’s best to have the image in an IMG tag for screen-readers when possible, so some simply browser detection could make this the fallback method.

This is an important concern, accessibility is important for everyone.

I do a $.browser.mozilla check in the script so my solution only runs on Firefox/Mozilla.