[css-break-3] Export terms

Author: fantasai

css-break-3/Overview.bs

@@ -128,7 +128,7 @@ Fragmentation Model and Terminology</h2>
   </dl>
 
   <p>
-    Each <dfn>fragmentation break</dfn> (hereafter, <dfn>break</dfn>)
+    Each <dfn export>fragmentation break</dfn> (hereafter, <dfn>break</dfn>)
     ends layout of the fragmented box in the current <a>fragmentainer</a>
     and causes the remaining content to be laid out in the next <a>fragmentainer</a>,
     in some cases causing a new <a>fragmentainer</a> to be generated
@@ -562,7 +562,7 @@ Types of Breaks</h3>
     There are different types of breaks in CSS, defined based on the type of
     fragmentainers they span:
   </p>
-  <dl>
+  <dl export>
     <dt><dfn>page break</dfn></dt>
     <dd>
       A break between two <a href="https://www.w3.org/TR/css3-page/#page-box">page boxes</a>.
@@ -602,7 +602,7 @@ Types of Breaks</h3>
 Forced Breaks</h3>
 
   <p>
-    A <dfn>forced break</dfn> is one explicitly indicated by the style sheet author.
+    A <dfn export>forced break</dfn> is one explicitly indicated by the style sheet author.
     A <a>forced break</a> occurs at a <a href="#btw-blocks">class A break point</a> if,
     among the 'break-after' properties specified on or propagated to the earlier sibling box
     and the 'break-before' properties specified on or propagated to the later sibling box
@@ -635,7 +635,7 @@ Unforced Breaks</h3>
   <p>
     While <a href="#breaking-controls">breaking controls</a> can force breaks,
     they can also discourage them.
-    An <dfn>unforced break</dfn> is one that is inserted automatically by the UA
+    An <dfn export>unforced break</dfn> is one that is inserted automatically by the UA
     in order to prevent content from overflowing the <a>fragmentainer</a>.
     The following rules control whether unforced breaking
     at a <a href="#possible-breaks">possible break point</a> is allowed: