[css-font-load-events] Use TypeError, per Anne's recommendation.

Author: tabatkins

css-font-load-events/Overview.html

@@ -418,10 +418,7 @@ <h5 class="heading settled heading" data-level=2.2.2.1 id=loadfont-method><span
 
 		<li>
 			If the <var>font load list</var> contains no font faces,
-			reject the promise with XXX.
-
-			<p class=issue id=issue-a2eabc2d><a class=self-link href=#issue-a2eabc2d></a>
-				DOMError?  Need to chat with Anne and others about idiomatic way to do errors.
+			reject the promise with a TypeError exception.
 
 		<li>
 			For all of the font faces in the <var>font load list</var>, initiate the load of any font that has
@@ -810,9 +807,6 @@ <h2 class="no-num heading settled" id=issues-index><span class=content>Issues In
 		Need to fill it in with the real stuff.
 
 	<a href=#issue-e86f85cf> ↵ </a><p class=issue>
-				DOMError?  Need to chat with Anne and others about idiomatic way to do errors.
-
-		<a href=#issue-a2eabc2d> ↵ </a><p class=issue>
 				When I define Font objects, and give them load() and ready() methods,
 				I want to define this as simply adopting a Promise.every() of all the font ready promises.
 				The fulfill/reject values then come out automatically.

css-font-load-events/Overview.src.html

@@ -345,10 +345,7 @@ <h5 id='loadfont-method'>
 
 		<li>
 			If the <var>font load list</var> contains no font faces,
-			reject the promise with XXX.
-
-			<p class='issue'>
-				DOMError?  Need to chat with Anne and others about idiomatic way to do errors.
+			reject the promise with a TypeError exception.
 
 		<li>
 			For all of the font faces in the <var>font load list</var>, initiate the load of any font that has