[css-backgrounds-4] Define background-clip: text

Author: tabatkins

css-backgrounds-4/Overview.bs

@@ -128,6 +128,26 @@ Background Positioning Longhands: the 'background-position-x', 'background-posit
 	This property specifies the background position's block-axis component.
 	An omitted origin keyword is assumed to be ''background-position-block/start''.
 
+<h3 id='background-clip'>
+Painting Area: the 'background-clip' property</h3>
+
+	<pre class="propdef partial">
+	Name: background-clip
+	New Values: text
+	</pre>
+
+	Issue: Or should this be defining the <css>-webkit-background-clip</css> property,
+	saying that all the values are identical,
+	with this additional ''text'' value?
+
+	<dl dfn-type=value dfn-for=background-clip>
+		<dt><dfn>text</dfn>
+		<dd>
+			The background is painted within (clipped to)
+			the union of the border box
+			and the geometry of the text in the element and its in-flow and floated descendants.
+	</dl>
+
 <h2 id="corners">
 Corners</h2>