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CSS and round corners


One of the best websites out there, in terms of functionality, is, and always has been, Amazon. In terms of accessibility though, they're not too good.

The problem

Amazon's menu tabs, for example, look really nice but are totally inaccessible. First of all, they're missing ALT tags. Additionally, the W3Cs accessibility guideline 3.1 (priority 2) clearly states:

When an appropriate markup language exists, use markup rather than images to convey information

This basically means don't use images to display text - site users with poor vision are unable to resize text that's displayed through images. Find out how to resize text in your browser, if you don't already know.

The solution

CSS, as usual, comes to our rescue. Adjust the text size in your browser now. Go on, do it. Did you see how the menu tabs at the top of the screen increased in size with the text and it all fits perfectly. Today, you're going to learn how to do this.

We start with a simple link:

Home

We'll assign it this CSS code:

a{ color: #000; background: #fb0; text-decoration: none }

Which gives us:

Home

Needs a bit of work, right?

Adding the left corner

We need to make a small image with the same colour: left tab - here's one I made earlier. Let's call this image "left-tab.gif" and place it into the background of this link:

a{ color: #000; background: #fb0 url("left-tab.gif") left top no-repeat; text-decoration: none }

This new command says that the background image should be "left-tab.gif", the image should be on the left, at the top, and it shouldn't be repeated - kind of obvious really. The result?

Home

We're getting there, but we need to move that text over a bit. It's pretty simple to do with a bit of padding:

a{ color: #000; background: #fb0 url("left-tab.gif") left top no-repeat; text-decoration: none; padding-left: 10px }

Home

And the right corner

We can only assign one background image to a tag so we need to make a new tag and assign an image to that. We can use:

Home

Now we just assign this background image right tab (another one I made earlier) to the and we're ready to go! We'll call this image "right-tab.gif"

a span{ background: url("right-tab.gif") right top no-repeat; }

This code means that every tag within an <a> tag will have this image as its background. And the final result:

Home

Perfect! So now you can... wait a minute, can you spot why it's not so perfect? That's right, we forgot to assign some padding to that tag:

a span{ background: url("right-tab.gif") right top no-repeat; padding-right: 10px }

Giving us:

Home

Now that really is perfect! Resize the text again and see how it looks!

Take this further

This article really only touches the basics of what you can accomplish with CSS and navigation. To take it even further, have a look at the article CSS Design: Creating Custom Corners & Borders featured at A List Apart.

This article was written by Trenton Moss. He's crazy about web usability and accessibility - so crazy that he went and started his own web usability and accessibility consultancy to help make the Internet a better place for everyone.

09 dec 2003 - 8435




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