Docs: Add info about <meta name="theme-color"...>

Ref: https://github.com/whatwg/meta-theme-color https://bugzilla.mozilla.org/show_bug.cgi?id=1013913 https://twitter.com/ahmednefzaoui/status/492344698493997057 http://updates.html5rocks.com/2014/11/Support-for-theme-color-in-Chrome-39-for-Android h5bp/html5-boilerplate@78c84ce Fix h5bp#234
shiaumayi · Feb 9, 2015 · 14a5331 · 14a5331
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@@ -334,6 +334,23 @@ to the home screen.
  * [jQuery Mobile Bookmark Bubble](https://github.com/okamototk/jqm-mobile-bookmark-bubble) (Mobile Safari, Android, BlackBerry).
  * [Concierge](https://github.com/alexgibson/concierge) (Firefox OS, Firefox for Android).
 
+## Theme Color
+
+You can add the [`theme-color` meta extension](https://github.com/whatwg/meta-theme-color)
+in the `<head>` of your pages to suggest the color that browsers and
+OSes should use if they customize the display of individual pages in
+their UIs with varying colors.
+
+```html
+<meta name="theme-color" content="#ff69b4">
+```
+
+The `content` attribute extension can take any valid CSS color.
+
+Currently, the `theme-color` meta extension is supported by [Chrome 39+
+for Android Lollipop](http://updates.html5rocks.com/2014/11/Support-for-theme-color-in-Chrome-39-for-Android)
+and [Firefox OS 2.1+](https://twitter.com/ahmednefzaoui/status/492344698493997057).
+
 ## Miscellaneous
 
 * Use [HTML5