Archive for the ‘accessibility’ Category

You’re Killing Me Here! Web Usability Screencast

Friday, March 24th, 2006
You're Killing Me Here!

Introducing “You’re Killing Me Here!” a series of screencasts discussing web site and web application design, accessibility, and usability from the perspective of a power-user.

The first episode discusses “type ahead find” in the Firefox browser and the design implications that come along with it.

View the Screencast

Apple iTunes accessibility color problems

Friday, March 10th, 2006

apple itunes accessibility problems

Okay, Apple, am I really expected to be able to read this? Let’s get a little bit of color contrast here…

Eliminating redisplay flashes in JavaScript

Thursday, March 9th, 2006

The Holy Grail in creating dynamic HTML is to have a page that works perfectly even when JavaScript is disabled. You want your page to be beautiful and dynamic, but you also want it to be accessible, search-engine optimized, and printable.

To make this happen you start with plain, semantic HTML, then you add a JavaScript layer to rework the page into something better:

JavaScript vs. No JavaScript

One problem with this technique is that your JavaScript must run after the HTML has been set up and rendered on the page, so a user with a slow connection might see something like this using my JavaScript tabbifier:

Animated simulation of HTML rendered then re-rendering using JavaScript

This is not too pretty, so obviously we want to make it stop.

Your first thought might be “I’ll just add a style to the content to make it hidden (CSS display:none), then my JavaScript will run and reveal it!” But that puts a big crack in our Holy Grail, because if you use CSS to hide the content, it will not be visible to users who do not have JavaScript.

Here’s the method I used:

  1. Add a class javascript-hide-me to the content you need to hide, but do not define that class in your CSS.
  2. Before the content, use JavaScript to define the CSS class. The easiest way to do this is by using document.write in the head section of the page, but you will have to directly modify the DOM if you are serving XHTML pages that use MIME type application/xhtml+xml.
  3. After the content has been transformed, use JavaScript to remove the CSS class and reveal the content.

Here are two examples, one that exhibits the flashing problem, and another that fixes it using the technique described above. Note that in order to see the flashing problem, you need a slow internet connection: I recommend throttling your connection using the excellent Charles Web Debugging Proxy.

Updates 2006-03-09

Welcome, Ajaxians!

Bobby describes an alternate technique in case you are serving XHTML pages that use MIME type application/xhtml+xml.

Steve Clay makes a valid point that we should check for DOM compatibility before writing the styles on the page.