Mark Pilgrim is switching from CSS hiding to mod_rewrite:
Each page links to two stylesheets: mu.css and om.css. Everybody gets mu.css, and the bulk of my styles are defined there. But for browser-specific workarounds, om.css gets redirected based on rules I set up in my .htaccess file
Two words: caching proxies. There’s no way for the proxy to know what is happening behind the scenes on the web server, it will cache the returned CSS as om.css and serve it to everyone.
There are probably some HTTP/1.1 headers that will prevent proxies from caching the file while still allowing the browser to do so, but why bother? Use pixels. People with vision problems that require on-demand font resizing ought to be using a browser that respects their needs. Upgrade, switch, or f’ck ‘em.
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