This shows how the computed style of each node differs from the computed style of its parent. The root element, which has no parent, is instead compared against the root of a blank HTML document.

* create a new bookmark called "compute styles" in your firefox toolbar. Place the snippet code in the location field of your "compute styles". click the compute styles bookmark, then click an element on the page with the crosshairs.

Gives you the ability to dynamically include a CSS file at any time in your HTML page using Javascript.

Here's a library to manage CSS class names on DOM elements.

a simple css way to add shadow to tables and Divs

Using styles we can add scrollbars for large table where the space is a constraint

Not really a hack, but rather a workaround for layout problems with IE.
Conditional

Get computed Height of an HTML Element

Get computed Width of an HTML Element

If you're an IE user you may have noticed that when you hover on a medium to large sized image, a toolbar appears in the corner of the image. It's basically useless as it accomplishes nothing that can't be done with a right-click.

Luckily, Microsoft has included a way for webmasters to disable this function.

This JScript code could be used in HTML applications (HTA) or other user-trusted web applications for saving data into files.