Highlighting New Elements
The “yellow fade” has become almost a cliché of Ajax: when something new materializes on the page, viewers expect to see it appear with a yellow background, which then slowly fades to white (or whatever the site’s usual background color is). It’s a handy way to let visitors know that something has changed without the overhead of having to keep track of what’s new versus newer versus newest.
It’s also a good introduction to jQuery, as you’ll be able to see how much can be done with only a few lines of code.
To highlight an element’s display: