Why does IE9 opens in Document Mode as IE7 standards?

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Try this answer: https://stackoverflow.com/a/13524518/1679310.

Summary, give the IE browser more information in the meta tag:

<!DOCTYPE html>
<html>
  <head>
    <title>My Web</title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />

Edit Note: As Olly Hodgson mentioned, the proper option is IE=edge, as currently stated in the above snippet. Below is the original, also working version:

   <meta http-equiv="X-UA-Compatible" content="IE=100" />

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