[css-ui-3] caret-color applies to all elements

Closes #725

Author: frivoal

css-ui/Overview.bs

@@ -1245,7 +1245,7 @@ boxes are generated for it and its cursor is used for the canvas.
 Name: caret-color 
 Value: auto | <<color>> 
 Initial: auto 
-Applies to: elements that accept input 
+Applies to: all elements
 Inherited: yes 
 Percentages: N/A 
 Media: interactive 
@@ -1268,6 +1268,16 @@ The caret is a visible indicator of the insertion point in an element where text
 
 Note: caret shape and blinking is outside the scope of this feature and thus unspecified.
 
+Note: UAs might have additional things that count as “carets”.
+For example, some UAs can show a “navigation caret”,
+which acts similarly to an insertion caret
+but can be moved around in non-editable text,
+and is functionally a caret.
+On the other hand, the cursor image shown
+when hovering over text when the 'cursor' property is ''cursor/auto'',
+or when hovering over an element where the 'cursor' property is ''cursor/text'' or ''cursor/vertical-text'',
+though it sometimes resembles a caret, is not a caret (it's a cursor).
+
 <div class="example">
 Example: a textarea with
 <code class="lang-css">caret-color:#00aacc;</code>
@@ -1514,6 +1524,8 @@ This appendix describes changes from the
 	    replaced elements representing images or videos
 	    and to iframes,
 	    for compatibility with level 4.
+	<li>Make the 'caret-color' property apply to all elements,
+	    so that it can also influence things like the navigation caret.
 </ul>
 
 <h2 class="no-num" id="security-privacy-considerations">Appendix C. Considerations for Security and Privacy</h2>