Tests

A few test HTML documents.

Border test
Test of getting an extra red border around a select element.
Overflowing <tbody>
Demonstrates how browsers render a table with <tbody> height set to a fixed size, and overflow to scroll.
Specifying font size: em or %?
Demonstrates how specifying the fontsize in em units yields different results than using equivalent % units on Internet Explorer.
Fonts
Displays fonts of several often-used typefaces together in one page.
The font-size-adjust CSS property
Demonstrates use of font-size-adjust. Uses an unusual font (Angsana New), which has strange characteristics to cater for.
CSS popups
Playing with CSS popups a bit.

The tests below are all using JavaScript to add functionality to web pages, or to detect such functionality.

DOM test
Displays which DOM features the current browser supports, if any.
Changed form fields
Demonstrates javascript function to remember which form fields are altered by the user.
Dynamic hiding
Demonstrates using Javascript to dynamically show/hide sections of a page.
Disable refresh
Demonstrates how to disable the refresh key in Mozilla and IE.
Dynamically add HTML
Demonstrates how to dynamically (i.e., client-side) add HTML to an existing page.

Check HTML - Check CSS