[css-sizing-3] Add <marquee> to the list of compressible elements, per web-compat (and just general reasoning). #6342

Author: tabatkins

css-sizing-3/Overview.bs

@@ -1307,7 +1307,7 @@ Compressible Replaced Elements</h4>
 		when it's displayed as a combination of a text input (shrinkable)
 		and a button (button-like, and thus not shrinkable).
 
-	* <{select}>, <{textarea}>, <{progress}>, <{meter}>.
+	* <{select}>, <{textarea}>, <{progress}>, <{meter}>, <{marquee}>.
 
 	Issue(6348): Tracking web-compat & implementation progress of applying this to max-width/height in <a href="https://github.com/w3c/csswg-drafts/issues/6348">Issue 6348</a>.