Handle inside a line-clamp container

Author: andreubotella

css-overflow-4/Overview.bs

@@ -325,6 +325,10 @@ it is ellipsed.</span>
 Text can overflow for example when it is prevented from wrapping
 (e.g. due to <code class="lang-css">white-space: nowrap</code>
 or a single word is too long to fit).
+
+If the [=block formatting context root=] is a [=line-clamp container=], the used
+value of this property is always ''text-overflow/clip''.
+
 Values have the following meanings:
 
 <dl dfn-for="text-overflow" dfn-type=value>