[css-text-decor-3] Clarify that text decorations are all ink overflow. #3272

Author: fantasai

css-text-decor-3/Overview.bs

@@ -945,7 +945,7 @@ Text Shadows: the 'text-shadow' property</h2>
   <p>Unlike 'box-shadow', text shadows are not clipped to the shadowed
     shape and may show through if the text is partially-transparent.
     Like 'box-shadow', text shadows do not influence layout, and do not
-    trigger scrolling or increase the size of the scrollable area.
+    trigger scrolling or increase the size of the <a>scrollable overflow region</a>.
 
   <p class="note">The painting order of shadows defined here is the opposite
     of that defined in the 1998
@@ -955,8 +955,11 @@ Text Shadows: the 'text-shadow' property</h2>
     <code>::first-line</code> and <code>::first-letter</code>
     pseudo-elements.</p>
 
-<h2 id="painting-order">
-Painting Order of Text Decorations</h2>
+<h2 id="painting">
+Painting Text Decorations</h2>
+
+<h3 id="painting-order">
+Painting Order of Text Decorations</h3>
 
   <p>
     As in [[!CSS2]], text decorations are drawn immediately over/under the text they decorate,
@@ -975,6 +978,15 @@ Painting Order of Text Decorations</h2>
     they are drawn over non-positioned content and just below any positioned descendants
     (immediately below layer #8 in CSS2.1 Appendix E).
 
+<h3 id="overflow">
+Overflow of Text Decorations</h3>
+
+  <p>
+    Text decorations that leak outside a <a>box</a>
+    are considered <a>ink overflow</a>:
+    they do not extend the <a>scrollable overflow region</a>.
+    [[css-overflow-3]]
+
 <h2 class="no-num" id="acknowledgements">
   Appendix A: Acknowledgements</h2>
 
@@ -1061,6 +1073,15 @@ Appendix B: Default UA Stylesheet</h2>
 <h2 class="no-num" id="changes">Appendix C:
 Changes</h2>
 
+  <h3 class="no-num" id="recent-changes">
+  Changes since the <a href="https://www.w3.org/TR/2018/CR-css-text-decor-3-20180703/">July 2018 Candidate Recommendation</a></h3>
+
+  <p>Significant changes include:</p>
+  <ul>
+    <li>Clarified that text decoration overflow is <a>ink overflow</a>.
+    (<a href="https://github.com/w3c/csswg-drafts/issues/3272">Issue 3272</a>)
+  </ul>
+
   <h3 class="no-num" id="recent-changes">
   Changes since the <a href="https://www.w3.org/TR/2013/CR-css-text-decor-3-20130801/">August 2013 Candidate Recommendation</a></h3>