Being a web developer since the IE3/4 and Netscape 3/4 days, I remember the real browser wars and the serious headache of getting a site to even barely look like the same site on more than one browser. If you write a site to Xhtml 1.1 strict and view in IE first (if you can get people upgraded to IE8 at least that will help), it'll work great in IE and mostly be fine in Firefox, Chrome, and Opera. They all interpreted spacing slightly different and the HTML4/Xhtml 1.1 specs were too open-ended, but with a few minor adjustments via javascript for Firefox and Chrome, the page can look identical on all the browsers.