Added Area Element class doc.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 1dd06d7ab7db1307690a116142a427cc59642f83..da05c5c053f9425dcc67a7e075cb984d487ec03c 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -454,6 +454,16 @@ class ApplicationCacheEvents extends Events {
 
 
 @DocsEditable
+/**
+ * DOM Area Element, which links regions of an image map with a hyperlink.
+ *
+ * The element can also define an uninteractive region of the map.
+ *
+ * See also:
+ *
+ * * [Area Element](https://developer.mozilla.org/en-US/docs/HTML/Element/area)

[Kathy Walrath, 2013/02/01 20:58:01]

Could we just say [<area>], since the MDN page is called <area>?

[<area>](...) on MDN.

If that doesn't work, maybe:

[Area element documentation](...) on MDN.

I don't remember what preposition we used before, but "from MDN" sounds wrong to
me.

+ * from MDN.
+ */
 @DomName('HTMLAreaElement')
 class AreaElement extends _Element_Merged {
   AreaElement.internal() : super.internal();