Kozea#1007 Make 'inherit' value work correctly for word-wrap and `o…

…verflow-wrap` properties

tests/test_css_validation.py

@@ -864,6 +864,8 @@ def test_overflow_wrap():
         'overflow_wrap': 'normal'}
     assert expand_to_dict('overflow-wrap: break-word') == {
         'overflow_wrap': 'break-word'}
+    assert expand_to_dict('overflow-wrap: inherit') == {
+        'overflow_wrap': 'inherit'}
     assert_invalid('overflow-wrap: none')
     assert_invalid('overflow-wrap: normal, break-word')
 
@@ -874,6 +876,8 @@ def test_expand_word_wrap():
         'overflow_wrap': 'normal'}
     assert expand_to_dict('word-wrap: break-word') == {
         'overflow_wrap': 'break-word'}
+    assert expand_to_dict('word-wrap: inherit') == {
+        'overflow_wrap': 'inherit'}
     assert_invalid('word-wrap: none')
     assert_invalid('word-wrap: normal, break-word')
 

weasyprint/css/validation/expanders.py

@@ -526,17 +526,19 @@ def expand_font(name, tokens):
 
 
 @expander('word-wrap')
-def expand_word_wrap(base_url, name, tokens):
+@generic_expander('overflow-wrap')
+def expand_word_wrap(name, tokens):
     """Expand the ``word-wrap`` legacy property.
 
-    See http://http://www.w3.org/TR/css3-text/#overflow-wrap
+    See http://www.w3.org/TR/css3-text/#overflow-wrap
 
     """
     keyword = overflow_wrap(tokens)
     if keyword is None:
         raise InvalidValues
 
-    yield 'overflow-wrap', keyword
+    if len(tokens) == 1:
+        yield 'overflow-wrap', tokens
 
 
 @expander('flex')