Is there any possibility of rendering differences betweeen firefox 3 and 3.5 and IE 7 and 8, even if

Posted by metal-gear-solid on Stack Overflow See other posts from Stack Overflow or by metal-gear-solid
Published on 2010-01-15T06:08:52Z Indexed on 2010/05/11 0:04 UTC
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I'm making a site for European client and he said Firefox 3 and IE 7 and 8 has more user than others browser for desktop in Europe http://gs.statcounter.com/#browser_version-eu-monthly-200812-201001-bar

I've only IE 7 and Firefox 3.5.7 installed in my PC.

Should I download portable Firefox 3.0 and test in it too even if I'm not using any new css property/selector which only has support in Firefox 3.5 or testing in 3.5.7 would be enough?

And for IE testing in IE 7 would be enough or should i check my site in IE8 (downloading VPC image of IE8 and testing in VM) even if I'm not using any new css property/selector which only has support in IE8?

Or is it necessary to use <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /> in <head> ?

But what will happen when user will switch compatibility mode to IE 8 default rendering mode?

Can we make site compatible in IE 7 and 8 both without using <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />? If yes, then what special we need to do.care/consider in css to make site identical in both?

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