L & G,

I have a an upcoming project with one of the terms of requirements as the following:

Windows and Macintosh platforms; versions 4.X and above for Netscape and
IE browsers, and current versions of AOL, MSN, and Opera browsers

I am a fan of open source software and have relied on open source web development tool like PHP and have never had a problem (reported to me anyway) with access to any websites I setup using any specific browser or platform.

My question is this -  Is there a development tool out there that guarantees uniform browser/platform independence?

I need to know for sure so as not to believe that all websites setup by me are all browser/platform independent simply because no one has complained about having difficulties in accessing them.

Many thanks for answers and contributions that may follow.

Dreamweaver works quite well?

Thanks Seun for the info.