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Validating your website
I have read that Internet Explorer is the least friendly browser to use because most of its previous versions do not support HTML5 or CSS3. When using the validator, what version of IE should you tell the validator to go back and check compatibility with to ensure a constant user experience? And at what point should a programmer/designer stop worrying about versions such as IE7 or IE8?
Andrew Shook31,709 Points
The rule of thumb that I personally use is 2 versions back, but sometimes you will run into other factors. The most important would be the clients needs. Do they absolutely need compatibility with EI 7/8? Unfortunately in some cases they do, so you grit your teeth and do it.