Docs: Lowercase attr values for X-UA-Compatible

Ref: h5bp#1656
jeffreznik · Mar 4, 2015 · 241b193 · 241b193
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diff --git a/doc/extend.md b/doc/extend.md
@@ -230,18 +230,20 @@ $(function(){
 
 ### Prompt users to switch to "Desktop Mode" in IE10 Metro
 
-IE10 does not support plugins, such as Flash, in Metro mode. If your site
-requires plugins, you can let users know that via the X-UA-Compatible meta
-element, which will prompt them to switch to Desktop Mode.
+IE10 does not support plugins, such as Flash, in Metro mode. If
+your site requires plugins, you can let users know that via the
+`x-ua-compatible` meta element, which will prompt them to switch
+to Desktop Mode.
 
 ```html
-<meta http-equiv="X-UA-Compatible" content="requiresActiveX=true">
+<meta http-equiv="x-ua-compatible" content="requiresActiveX=true">
 ```
 
-Here's what it looks like alongside H5BP's default X-UA-Compatible values:
+Here's what it looks like alongside H5BP's default `x-ua-compatible`
+values:
 
 ```html
-<meta http-equiv="X-UA-Compatible" content="IE=edge,requiresActiveX=true">
+<meta http-equiv="x-ua-compatible" content="ie=edge,requiresActiveX=true">
 ```
 
 You can find more information in [Microsoft's IEBlog post about prompting for

diff --git a/doc/html.md b/doc/html.md
@@ -47,14 +47,14 @@ important because:
      Internet Explorer
 
 2) the meta tag for compatibility mode
-   (`<meta http-equiv="X-UA-Compatible" content="IE=edge">`):
+   (`<meta http-equiv="x-ua-compatible" content="ie=edge">`):
 
    * [needs to be included before all other tags except for the `<title>` and
      the other `<meta>`
      tags](http://msdn.microsoft.com/en-us/library/cc288325.aspx)
 
 
-### `X-UA-Compatible`
+### `x-ua-compatible`
 
 Internet Explorer 8/9/10 support [document compatibility
 modes](http://msdn.microsoft.com/en-us/library/cc288325.aspx) that affect the
@@ -63,10 +63,10 @@ visitor is using, let's say, Internet Explorer 9, it's possible that IE will not
 use the latest rendering engine, and instead, decide to render your page using
 the Internet Explorer 5.5 rendering engine.
 
-Specifying the `X-UA-Compatible` meta tag:
+Specifying the `x-ua-compatible` meta tag:
 
 ```html
-<meta http-equiv="X-UA-Compatible" content="IE=edge">
+<meta http-equiv="x-ua-compatible" content="ie=edge">
 ```
 
 or sending the page with the following HTTP response header