When coding any website it is imperative to check that your code renders in a suitable fashion (preferably valid of course) on all browsers, be it Safari, Firefox, Internet Explorer or Opera making sure your site is accessible to as many potential visitors is something that can not be ignored; and why should it? If you decided to code for just one browser exclusively you would be denying yourselves could be visitors.
Of course checking that your site looks right in individual browsers can be a chore, so before downloading every browser on the planet make sure your code is valid, sure your code may well be pretty stable but different browsers has a habit unfortunately of rendering code in ;
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