diff --git bleach/_vendor/html5lib/constants.py b/bleach/_vendor/html5lib/constants.py
index fe3e237..11184e0 100644
--- bleach/_vendor/html5lib/constants.py
+++ bleach/_vendor/html5lib/constants.py
@@ -571,7 +571,8 @@ voidElements = frozenset([
     "col",
     "input",
     "source",
-    "track"
+    "track",
+    "wbr",
 ])
 
 cdataElements = frozenset(['title', 'textarea'])
diff --git bleach/_vendor/html5lib/filters/sanitizer.py b/bleach/_vendor/html5lib/filters/sanitizer.py
index 5c31e97..74a7c91 100644
--- bleach/_vendor/html5lib/filters/sanitizer.py
+++ bleach/_vendor/html5lib/filters/sanitizer.py
@@ -128,6 +128,7 @@ allowed_elements = frozenset((
     (namespaces['html'], 'ul'),
     (namespaces['html'], 'var'),
     (namespaces['html'], 'video'),
+    (namespaces['html'], 'wbr'),
     (namespaces['mathml'], 'maction'),
     (namespaces['mathml'], 'math'),
     (namespaces['mathml'], 'merror'),