[selectors-4] Match HTML's use of certain terms defined in it. (w3c#6415)

Author: hober

selectors-4/Overview.bs

@@ -35,11 +35,6 @@ spec:css-pseudo-4; type:selector;
 	text: ::after
 	text: ::first-line
 	text: ::first-letter
-spec:HTML; type:dfn;
-	text: effective media volume
-	text: seeking
-	text: media data
-	text: stall timeout
 </pre>
 
 <style>
@@ -2436,18 +2431,18 @@ Media Loading State: the '':buffering'' and '':stalled'' pseudo-classes</h3>
 	The <dfn>:buffering</dfn> pseudo-class represents an element
 	that is capable of being “played” or “paused”,
 	when that element cannot continue playing
-	because it is actively attempting to obtain [=media data=]
+	because it is actively attempting to obtain [=HTMLMediaElement/media data=]
 	but has not yet obtained enough data to resume playback.
 	(Note that the element is still considered to be “playing” when it is “buffering”.
 	Whenever '':buffering'' matches an element,
 	'':playing'' also matches the element.)
 
 	The <dfn>:stalled</dfn> pseudo-class represents an element
 	when that element cannot continue playing
-	because it is actively attempting to obtain [=media data=]
+	because it is actively attempting to obtain [=HTMLMediaElement/media data=]
 	but it has failed to receive any data for some amount of time.
 	For the <{audio}> and <{video}> elements of HTML,
-	this amount of time is the [=stall timeout=]. [[HTML]]
+	this amount of time is the [=media element stall timeout=]. [[HTML]]
 	(Note that, like with the '':buffering'' pseudo-class,
 	the element is still considered to be “playing” when it is “stalled”.
 	Whenever '':stalled'' matches an element,
@@ -2464,7 +2459,7 @@ Sound State: the '':muted'' and '':volume-locked'' pseudo-classes</h3>
 	The <dfn>:volume-locked</dfn> pseudo-class represents
 	an element capable of making sound
 	when programmatically changing the element’s volume
-	does not change the element's [=effective media volume=].
+	does not change the element's [=HTMLMediaElement/effective media volume=].
 
 <h2 id='input-pseudos'>
 The Input Pseudo-classes</h2>