When you’re building a site, make sure you check out your web site in multiple web browsers other than the one browser you use every day.
The ones you want to pay attention to are: Firefox, Internet Explorer versions 7 to 10, as well as Chrome, Safari, and Opera.
If you’re on a Mac, unless you have a virtual Windows installation, then IE is not available. So a great way to QA your site is with Adobe’s Browser Labs web app that will let you see how different web browsers render your site. They also have multiple versions of IE available. Sometimes the different versions of Internet Explorer renders pages very different from each other. Adobe Browser Labs is free and easy to use.
Remember that your site’s not going to always look perfect in all the browsers so if you’re 95% “good to go” on Firefox and Chrome, then launch your site and make post launch fixes. Internet Explorer has always been something of a headache for web developers but enjoys a about 40% of the market. Click here for some browser market share stats.
Get it: Adobe’s Browser Labs