X-UA-Compatible content IE 9 IE 8 IE 7 IE EDGE

Question

lt meta http-equiv  X-UA-Compatible  content  IE 9  IE 8  IE 7  IE EDGE    gt     Actually what is the meaning of this statement   Some of the examples use   to separate versions of IE  while some use    which is correct  The order IE 9  IE 8  IE 7  IE EDGE has some importance  I wish to know that    Edit  I am using  lt  DOCTYPE html gt

User · Answer

In certain cases  it might be necessary to restrict the display of a webpage to a document mode supported by an earlier version of Internet Explorer  You can do this by serving the page with an x-ua-compatible header  For more info  see Specifying legacy document modes    - https   msdn microsoft com library cc288325   Thus this tag is used to future proof the webpage  such that the older   compatible engine is used to render it the same way as intended by the creator    Make sure that you have checked it to work properly with the IE version you specify

User · Answer

If you support IE  for versions of Internet Explorer 8 and above  this    lt meta http-equiv  X-UA-Compatible  content  IE 9  IE 8  IE 7    gt    Forces the browser to render as that particular version s standards  It is not supported for IE7 and below   If you separate with semi-colon  it sets compatibility levels for different versions  For example    lt meta http-equiv  X-UA-Compatible  content  IE 7  IE 9    gt    Renders IE7 and IE8 as IE7  but IE9 as IE9  It allows for different levels of backwards compatibility  In real life  though  you should only chose one of the options    lt meta http-equiv  X-UA-Compatible  content  IE 8    gt    This allows for much easier testing and maintenance  Although generally the more useful version of this is using Emulate    lt meta http-equiv  X-UA-Compatible  content  IE EmulateIE8    gt    For this    lt meta http-equiv  X-UA-Compatible  content  IE Edge    gt    It forces the browser the render at whatever the most recent version s standards are    For more information  there is plenty to read about on MSDN

[html] "X-UA-Compatible" content="IE=9; IE=8; IE=7; IE=EDGE"

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