Reference CSS discussion on font-based fingerprinting attacks and mitigation strategies (#530)

Author: palemieux

imsc1/spec/ttml-ww-profiles.html

@@ -4988,6 +4988,11 @@ <h2>Privacy and Security Considerations</h2>
     <ul>
       <li>Appendix P.7 (Access to Processing State), since the <code>condition</code> attribute is not supported.</li>
     </ul>
+
+    <aside class="ednote"><a href="https://github.com/w3c/imsc/issues/530">Issue 530</a> explores whether the font-based
+    fingerprinting attacks and mitigation strategies <a href="https://github.com/w3c/csswg-drafts/issues/4055">discussed</a> in the
+    context of [[css-fonts-3]] are applicable to this specification, which makes use of the <a
+    data-cite="!css-fonts-3/#font-matching-algorithm">Font Matching Algorithm</a>.</aside>
   </section>
 
   <section id="substantive-changes-summary" class="appendix informative">