[css-tables] Clarify percentage-behaving-as-auto pending #1051

Author: FremyCompany

css-tables-3/Overview.bs

@@ -1835,7 +1835,8 @@ spec:css22; type:property; text:display
 
 				It is further clarified that
 					a cell is considered to have its height specified explicitly
-					if the computed height of the cell or any of its table ancestors is a length or percentage.
+					if the computed height of the cell or any of its table ancestors is a length or percentage,
+					and that percentage does not <a href="https://github.com/w3c/csswg-drafts/issues/1051">behave as auto</a>.
 
 			</div>