[selectors] Rename :user-error to :user-invalid

Author: fantasai

selectors/Overview.bs

@@ -2320,13 +2320,13 @@ The Optionality Pseudo-classes: '':required'' and '':optional''</h4>
 	form elements are neither required nor optional.
 
 <h4 id="user-pseudos">
-The User-interaction Pseudo-class: '':user-error''</h4>
+The User-interaction Pseudo-class: '':user-invalid''</h4>
 
-	The <dfn id="user-error-pseudo">:user-error</dfn> pseudo-class
-	represents an input element with incorrect input, but only
+	The <dfn id="user-error-pseudo">:user-invalid</dfn> pseudo-class
+	represents an element with incorrect input, but only
 	<em>after</em> the user has significantly interacted with it.
 	The '':user-error'' pseudo-class
-	must match an '':invalid'', '':out-of-range'', or empty-but-'':required'' form element
+	must match an '':invalid'', '':out-of-range'', or blank-but-'':required'' elements
 	between the time the user has attempted to submit the form
 	and before the user has interacted again with the form element.
 	User-agents may allow it to match such elements at other times,
@@ -2354,31 +2354,14 @@ The User-interaction Pseudo-class: '':user-error''</h4>
 		</pre>
 	</div>
 
-	<div class="issue">
-		This pseudo-class, which was taken from the
-		<a href="https://developer.mozilla.org/en-US/docs/Web/CSS/%3A-moz-ui-invalid">'':-moz-ui-invalid''</a> selector,
-		is named '':user-error'' rather than '':user-invalid''
-		because it combines checks for validity as well as omission.
-		We thought if it became necessary to distinguish between omitted and invalid values,
-		'':user-invalid'' and '':user-omitted'' could be used.
-
-		Alternatively, it might make more sense to rename this to '':user-invalid''
-		and add a '':blank'' pseudo-class that meant the field was blank.
-		This would allow authors to combine '':user-invalid:blank'' to select omitted required values,
-		and to combine '':user-invalid:not(:blank)'' to select filled out invalid values,
-		if necessary.
-
-		Both options are reasonable;
-		however since I can't think of a name for the '':-moz-ui-valid''
-		that would reasonably parallel '':user-error'',
-		I'm leaning somewhat to the second option.
-		(Other opinions welcome.)
-	</div>
+	Issue: Cross-check with <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/%3A-moz-ui-invalid">'':-moz-ui-invalid''</a>.
 
-	Issue: Look into standardizing <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/%3A-moz-ui-valid">:-moz-ui-valid</a> as well.
+	Issue: Add <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/%3A-moz-ui-valid">:-moz-ui-valid</a> as '':user-valid'' per WG resolution.
 
 	Issue: Evaluate proposed <a href="https://lists.w3.org/Archives/Public/www-style/2014Feb/0511.html">:dirty pseudo-class</a>
 
+	Issue: Clarify that this (and '':invalid''/'':valid'') can apply to form and fieldset elements.
+
 <h2 id="structural-pseudos">
 Tree-Structural pseudo-classes</h2>