Test your browser fonts
Does yours support Greek text?
Does yours support Russian text?
Browser tooltips support
Character entity rendering test
fill horizontal space with dots
CSS positioning test
An HTML anchor / button
Try CSS2 counters
Tabs using CSS
Drop-Caps using CSS
Decorating with HTML Tables
Vertical alignment of inline tables
CSS @media type support
Pop-up dialogs with CSS
Rows of alternating colors with CSS
Inside the JavaScript navigator
navigator
JavaScript properties browser
Move text
Flip text
Uncover text
A desktop calculator
A Unicode script chart
SciFi blinky computer panel
A JavaScript painting program
Read external text via iframe
iframe
Keyboards for various languages
Graphics that scale with window
Graphics that scale with font size