Targetting CSS at IE5
6th October 2003
Tantek has created/discovered a new CSS hack, the Mid Pass Filter. This filter allows you to write CSS rules that will only be applied by IE 5 and IE 5.5 for Windows. This is great news, as those are the browsers with the broken box model (provided you trigger standards mode in IE 6).
As with almost all hacks it looks pretty revolting. My recommendation is to accompany all hacks like this used in live stylesheets with a commented link to the page describing the technique.
More recent articles
- New prompt injection papers: Agents Rule of Two and The Attacker Moves Second - 2nd November 2025
 - Hacking the WiFi-enabled color screen GitHub Universe conference badge - 28th October 2025
 - Video: Building a tool to copy-paste share terminal sessions using Claude Code for web - 23rd October 2025