1 files changed, 4 insertions, 0 deletions
diff --git a/TODO.txt b/TODO.txt
index 2f03dd2..06dd6bc 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -6,6 +6,10 @@ Bugs
 * html5lib doesn't support SoupStrainers, which is OK, but there
   should be a warning about it.
 
+* HTML5 defines more multivalue attributes: iframe.sandbox,
+  output.for, icon.sizes, *.accesskey, *.dropzone, td.headers,
+  th.headers, a.rel, area.rel, link.rel, *.class, form.accept-charset
+
 Big features
 ------------