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More than that, cross PLATFORM rendering can hold some more surprises -- for instance, IE5 on Macintosh is a little devil of a browser! And that combo may be upwards of 6% of your visitors.
Nevertheless, Netscape or Mozilla is a great first development environment. Validated code that looks good there will often need no further work, especially on relatively simple layout.
If it works in Mozilla, Opera (6 & 7), IE (5, 5.5 & 6) -- it will work in most other browsers ;)
<?php header("Content-type: application/xhtml+xml");?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <title>Eat this, IE!</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> </head> <body> <h1>Eat this, IE!</h1> <p>This will work perfectly in Mozilla, but break in virtually anything else!</p> <p>So you can <em>never</em> be sure...</p> </body> </html>