Support the <wbr> element (html5lib#395)

Co-authored-by: Łukasz Langa <lukasz@langa.pl>

Author: twm

CHANGES.rst

@@ -4,13 +4,23 @@ Change Log
 1.2
 ~~~
 
+Unreleased yet
+
+Features:
+
+* Add support for the ``<wbr>`` element in the sanitizer, `which indicates
+  a line break opportunity <https://html.spec.whatwg.org/#the-wbr-element>`_.
+  This element is allowed by default. (#395) (Thank you, Tom Most!)
+
 Bug fixes:
 
 * The sanitizer now permits ``<summary>`` tags.
 
 1.1
 ~~~
 
+Released on June 23, 2020
+
 Breaking changes:
 
 * Drop support for Python 3.3. (#358)

html5lib/constants.py

@@ -571,7 +571,8 @@
     "col",
     "input",
     "source",
-    "track"
+    "track",
+    "wbr",
 ])
 
 cdataElements = frozenset(['title', 'textarea'])

html5lib/filters/sanitizer.py

@@ -129,6 +129,7 @@
     (namespaces['html'], 'ul'),
     (namespaces['html'], 'var'),
     (namespaces['html'], 'video'),
+    (namespaces['html'], 'wbr'),
     (namespaces['mathml'], 'maction'),
     (namespaces['mathml'], 'math'),
     (namespaces['mathml'], 'merror'),

html5lib/tests/test_sanitizer.py

@@ -55,6 +55,12 @@ def test_data_uri_disallowed_type():
     assert expected == sanitized
 
 
+def test_wbr_allowed():
+    sanitized = sanitize_html('<wbr>')
+    expected = '<wbr/>'
+    assert expected == sanitized
+
+
 def param_sanitizer():
     for ns, tag_name in sanitizer.allowed_elements:
         if ns != constants.namespaces["html"]: