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First of all, not 'everybody' uses IE. This statement is false and confusing.
Secondly, the fact that IE was launched 2 years after NS 4.x makes your argument even weaker, in the sense that it SHOULD at the time allow for PROPER CSS 1 and CSS 2 support!
Thank you for acknowledging the fact that 'there are better programs out there'. Of course there are and I urge everyone to get a copy of Mozilla, Firebird, Camino (for OS X users), use Konqueror, Epiphany, Galeon, Opera, Omniweb etc Would you like me to go on?
In any case, no one is barring anyone. My site is also as cross-browser compatible as possible, but since XOOPS relies heavily on CSS, there could be problems with some themes and some browsers.
Of course one could hardcode the style into the theme.html file and 'lock' it there, but is it worth it taking one step forward and two steps backwards?