- capitalize Element Query

- rename “Why” to “Motivation”
- add “Use cases” section

Author: jonathantneal

README.md

@@ -1,12 +1,18 @@
-# Element query demos
+# Element Query demos
 
 *As yet unproposed*, the Element Queries CSS module allows developers to style elements based on their size and shape.
 
 This repository catalogs Element Query implementations realized through JavaScript.
 
-## Why
+## Motivation
 
 Element Queries are the natural and much-needed evolution of Media Queries.
 Where Media Queries cared about the size of the *screen*, Element Queries care about the size of the *thing*.
 As a result, Element Queries allow content to adapt to a wide range of viewing experiences without having to change the content itself.
 They also simplify stylesheets by removing the need to specify layout conditions between the screen and the element being styled.
+
+## Use cases
+
+The simpliest use case is: “I have a widget that needs to look good in any column of our layout, whether that column is small, medium, or large.”
+
+Use cases are more fully documented in the [Use Cases and Requirements for Element Queries Editor’s Draft](http://responsiveimagescg.github.io/eq-usecases/).