[css-images-4] Don't compute stripe() percentages to absolute lengths. w3c#8140

Author: fantasai

css-images-4/Overview.bs

@@ -1985,12 +1985,11 @@ Color Stop “Fixup”</h4>
 		as the <<flex>> values approach zero.)
 	</div>
 
-	The computed value of this function is the [=specified value=]
-	with all <<color>>s computed
-	and all <<length-percentage>>s absolutized and computed to the extent possible.
-
-	Issue: Do we actually want to compute everything through to an absolute length?
-	It might not make that much sense for inheritance that way.
+	The [=computed value=] of this function is
+	an ordered list of stripes,
+	each given as a [=computed color=]
+	and a thickness represented either a <<flex>> value
+	or a computed <<length-percentage>> value.
 
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