How to force IE10 to render page in IE9 document mode

Question

I have two questions:

1. How can I force IE10 to render in IE9 document mode? Currently it's rendering my page in Standard document mode.

2. In IE10's developer toolbar, I am not able to see the option of document mode of IE10. Is it not implemented, or is my browser version is out of date?

Thanks for all your help.

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Edit: thanks everyone for the solutions provided. Earlier I was using a meta tag <meta http-equiv="x-ua-compatible" content="IE=edge" > just to make sure that IE will render the page in highest document mode, but I was facing some issues with IE10 standard mode, so I changed the meta tag to render the page in IE9 mode: <meta http-equiv="x-ua-compatible" content="IE=9" >.

Answer 1

You should be able to do it using the X-UA meta tag:

<meta http-equiv="X-UA-Compatible" content="IE=9" /> 

However, if you find yourself having to do this, you're probably doing something wrong and should take a look at what you're doing and see if you can do it a different/better way.

Answer 2

Do you mean you want to tell your copy of IE 10 to render the pages it views in IE 9 mode?

Or do you mean you want your website to force IE 10 to render it in IE 9 mode?

For the former:

To force a webpage you are viewing in Internet Explorer 10 into a particular document compatibility mode, first open F12 Tools by pressing the F12 key. Then, on the Browser Mode menu, click Internet Explorer 10, and on the Document Mode menu, click Standards.

http://msdn.microsoft.com/en-gb/library/ie/hh920756(v=vs.85).aspx

For the latter, the other answers are correct, but I wouldn't advise doing that. IE 10 is more standards-compliant (i.e. more similar to other browsers) than IE 9.