[css-text-4] Mark preserve-trim at risk

Author: frivoal

css-text-4/Overview.bs

@@ -12,6 +12,7 @@ Editor: Koji Ishii, Invited Expert, kojiishi@gluesoft.co.jp
 Editor: Alan Stearns, Adobe Systems, stearns@adobe.com
 Abstract: This module defines properties for text manipulation and specifies their processing model. It covers line breaking, justification and alignment, white space handling, and text transformation.
 Ignored terms: segment break, segment breaks
+At Risk: The ''preserve-trim'' of the 'text-space-collapse' property
 </pre>
 
 <h2 id="intro">
@@ -85,6 +86,13 @@ White Space Collapsing: the 'text-space-collapse' property</h3>
 			the advance widths of all preserved white space
 			that occur at the end of a line.
 
+			Note: the ''preserve-trim'' value is at risk.
+
+			Issue: The CSSWG would appreciate feedback
+			on the use cases for this value,
+			to evaluate whether trimming leading spaces
+			could be needed as well.
+
 		<dt><dfn>preserve-breaks</dfn>
 		<dd>
 			This value collapses white space as for ''collapse'', but preserves