Meta: export header value

Author: annevk

fetch.bs

@@ -752,7 +752,8 @@ a <a for=/>header list</a> <var>list</var>, run these steps:
 <p>A <dfn export>header name</dfn> is a <a for=/>byte sequence</a> that matches the
 <a spec=http>field-name</a> token production.
 
-<p>A <dfn>header value</dfn> is a <a for=/>byte sequence</a> that matches the following conditions:
+<p>A <dfn export>header value</dfn> is a <a for=/>byte sequence</a> that matches the following
+conditions:
 
 <ul class=brief>
  <li><p>Has no leading or trailing <a>HTTP tab or space bytes</a>.