[DISCUSSION] How much effort are you putting into making it work for various browsers?

[eluser]Damien K.[/eluser]
I personally think that something more stimulating should crop up now and then in the forum to get the community engaged (no, not to flame people) as opposed to the 99% of the trivial (but relevant, depending on perspectives) questions.

Here is my stimulating question of the day, after stumbling on a similar topic in the forum.

I code all my apps for Firefox 3. 99.99% of the features/functionality works for all versions of IE (the other major browser), including version 6. This leads to me one conclusion: applications that don't achieve similar "success" rates contain non-standard code. What is your take on this?