The actual standard is HTML (or DHTML). Both Netscape (the company) and Microsoft chose to 'embrace and extend' the standard, in different directions but for the same basic reason. The most HTML compliant browser to write to would be iCab. With every page visited it displays an icon that tells you if the source is proper HTML. Even better, it run on the Macintosh. =) As Netscape (the company) was foundering on the reef of ecommerce, the crew sort of threw the cargo overboard, i.e. they open-sourced their browser technology as Mozilla. Of course the problem with open source software is that it doesn't ship until it actually works; so it's still in development. Then there's Opera, which is cross palatform. Is that still in beta? I will go look at the site now.