[css-text-4] Clamp then balance

see #9310

css-text-4/Overview.bs

@@ -5487,6 +5487,10 @@ Selecting How to Wrap: the 'text-wrap-style' property</h3>
 
  Missing test:
  * tests for values other than balance
+ * tests for
+ <q>If the element is affected by 'line-clamp',
+ the claming effect is applied first,
+ then the remaining lines are balanced.</q>
  * Direct tests of this property as a longhand"></wpt>
 
  <pre class="propdef">
@@ -5578,6 +5582,9 @@ Selecting How to Wrap: the 'text-wrap-style' property</h3>
 
  Groups of lines separated by a [=forced line break=]
  are processed separately.
+ If the element is affected by 'line-clamp',
+ the claming effect is applied first,
+ then the remaining lines are balanced.
 
  <wpt>
  white-space/text-wrap-balance-004.html