[css-cascade] Switch term to 'cascade origin'. Dfn the various origins.

Author: tabatkins

css-cascade/Overview.bs

@@ -738,23 +738,23 @@ Cascading</h2>
 <h3 id='cascading-origins'>
 Cascading Origins</h3>
 
-	Each style rule has an <dfn export>origin</dfn>,
+	Each style rule has an <dfn id="origin" export local-lt="origin">cascade origin</dfn>,
 	which determines where it enters the cascade.
 	CSS defines three core <a>origins</a>:
 
 	<dl>
-		<dt id='cascade-origin-author'>Author
+		<dt><dfn export id='cascade-origin-author'>Author Origin</dfn>
 		<dd>
 			The author specifies style sheets for a source document according to the conventions of the document language. For instance, in HTML, style sheets may be included in the document or linked externally.
 
-		<dt id='cascade-origin-user'>User
+		<dt><dfn export id='cascade-origin-user'>User Origin</dfn>
 		<dd>
 			The user may be able to specify style information for a particular document.
 			For example, the user may specify a file that contains a style sheet
 			or the user agent may provide an interface that generates a user style sheet
 			(or behaves as if it did).
 
-		<dt id='cascade-origin-ua'>User agent
+		<dt><dfn export id='cascade-origin-ua' lt="user agent origin|ua origin">User Agent Origin</dfn>
 		<dd>
 			Conforming user agents must apply a default style sheet
 			(or behave as if they did).
@@ -766,16 +766,16 @@ Cascading Origins</h3>
 	Extensions to CSS define the following additional <a>origins</a>:
 
 	<dl>
-		<dt id='cascade-origin-override'>Override
+		<dt><dfn export id='cascade-origin-override'>Override Origin</dfn>
 		<dd>
 			DOM Level 2 Style [[!DOM-LEVEL-2-STYLE]] defines an interface for “override” styles,
 			which enter the cascade at a higher level than other author rules.
 
-		<dt id='cascade-origin-animation'>Animation
+		<dt><dfn export id='cascade-origin-animation'>Animation Origin</dfn>
 		<dd>
 			CSS Animations [[CSS3-ANIMATIONS]] generate “virtual” rules representing their effects when running.
 
-		<dt id='cascade-origin-transition'>Transition
+		<dt><dfn export id='cascade-origin-transition'>Transition Origin</dfn>
 		<dd>
 			Like CSS Animations, CSS Transitions [[CSS3-TRANSITIONS]] generate “virtual” rules representing their effects when running.
 	</dl>