[css-pseudo-4] Update Changes list

Author: fantasai

css-pseudo-4/Overview.bs

@@ -1298,6 +1298,32 @@ Changes</h2>
 
   Significant changes since the <a href="https://www.w3.org/TR/2019/WD-css-pseudo-4-20190225/">25 February 2019 Working Draft</a> include:
 
+  <ul>
+    <li>Added ''::first-letter::prefix'' and ''::first-letter::postfix'' [=sub-pseudo-elements=]
+      to address punctuation associated with the ''::first-letter'' [=pseudo-element=].
+      (<a href="https://github.com/w3c/csswg-drafts/issues/2040">Issue 2040</a>)
+    <li>Added Symbols to possible [=first letters=].
+      (<a href="https://github.com/w3c/csswg-drafts/issues/5099">Issue 5099</a>)
+    <li>Excluded word separators from [=first-letter text=].
+      (<a href="https://github.com/w3c/csswg-drafts/issues/5830">Issue 5830</a>)
+    <li>Excluded opening and dash punctuation from [=first-letter text=].
+      (<a href="https://github.com/w3c/csswg-drafts/issues/5830">Issue 5830</a>)
+    <li>Rewrote and clarified definition of '':first-letter'', and improved examples and notes.
+    <li>Rewrote and clarified definition of ''::first-line'', and improved examples.
+    <li>Defined interaction of 'line-height' and ''::first-line''.
+    <li>Defined box structure interaction of ''::first-line'' and ''::first-letter''.
+    <li>Clarified painting order of highlight text decorations.
+    <li>Removed 'caret-color' and 'cursor' from applying to [=highlight pseudo-elements=].
+      (<a href="https://github.com/w3c/csswg-drafts/issues/4100">Issue 4100</a>)
+    <li>Extended the {{CSSPseudoElement}} interface
+      with a {{CSSPseudoElement/parent}} attribute
+      and {{CSSPseudoElement/pseudo()}} method
+      to address [=sub-pseudo-elements=].
+      (<a href="https://github.com/w3c/csswg-drafts/issues/3836">Issue 3836</a>)
+  </ul>
+
+  Significant changes since the <a href="https://www.w3.org/TR/2019/WD-css-pseudo-4-20190225/">25 February 2019 Working Draft</a> include:
+
   <ul>
     <li>Added ''::target-text'' pseudo-element.
     (<a href="https://github.com/w3c/csswg-drafts/issues/5522">Issue 5522</a>)