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Make IE8 behave like IE7Tag(s): Varia

By default, IE8 is more standard compliant than IE7. This fact can make some pages to not render correctly if they are designed with IE7 specific behavior.

You can tell to IE8 to render a page like IE7 by adding a special META tag in the HEAD section.

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7"/>
<body>Renders the same in IE8 as it did in IE7</body>

ref :