Merge pull request #1010 from youennf/export-allowed-required-constra…

…ints

Export the allowed required constraints for device selection definition

getusermedia.html

@@ -3952,7 +3952,7 @@ <h2>Methods</h2>
         no longer suitable. In this case, a NotReadableError will result.</p>
       </div>
       <div>
-        <p>The <dfn>allowed required constraints for device selection</dfn>
+        <p>The <dfn class="export">allowed required constraints for device selection</dfn>
         contains the following constraint names:
           <a>width</a>,
           <a>height</a>,