Support "overflow-wrap: anywhere"

tests/test_text.py

@@ -891,6 +891,7 @@ def test_hyphenate_limit_chars_punctuation(css):
 
 @assert_no_logs
 @pytest.mark.parametrize('wrap, text, test, full_text', (
+    ('anywhere', 'aaaaaaaa', lambda a: a > 1, 'aaaaaaaa'),
     ('break-word', 'aaaaaaaa', lambda a: a > 1, 'aaaaaaaa'),
     ('normal', 'aaaaaaaa', lambda a: a == 1, 'aaaaaaaa'),
     ('break-word', 'hyphenations', lambda a: a > 3,
@@ -920,6 +921,32 @@ def test_overflow_wrap(wrap, text, test, full_text):
     assert full_text == lines_full_text
 
 
+@assert_no_logs
+@pytest.mark.parametrize('wrap, text, body_width, expected_width', (
+    ('anywhere', 'aaaaaa', 10, 20),
+    ('anywhere', 'aaaaaa', 40, 40),
+    ('break-word', 'aaaaaa', 40, 100),
+    ('normal', 'aaaaaa', 40, 100),
+))
+def test_overflow_wrap_2(wrap, text, body_width, expected_width):
+    page, = render_pages('''
+      <style>
+        @font-face {src: url(weasyprint.otf); font-family: weasyprint}
+        body {width: %dpx; font-family: weasyprint; font-size: 20px; }
+        table {overflow-wrap: %s; white-space: normal; }
+      </style>
+      <table><tr><td>%s
+    ''' % (body_width, wrap, text))
+    html, = page.children
+    body, = html.children
+    table_wrapper, = body.children
+    table, = table_wrapper.children
+    row_group, = table.children
+    tr, = row_group.children
+    td, = tr.children
+    assert td.width == expected_width
+
+
 def white_space_lines(width, space):
     page, = render_pages('''
       <style>

weasyprint/css/validation/properties.py

@@ -1176,7 +1176,7 @@ def white_space(keyword):
 @single_keyword
 def overflow_wrap(keyword):
     """``overflow-wrap`` property validation."""
-    return keyword in ('normal', 'break-word')
+    return keyword in ('anywhere', 'normal', 'break-word')
 
 
 @property()

weasyprint/text/line_break.py

@@ -536,7 +536,8 @@ def split_first_line(text, style, context, max_width, justification_spacing,
     first_line_width, _ = line_size(first_line, style)
     space = max_width - first_line_width
     # If we can break words and the first line is too long
-    if not minimum and overflow_wrap == 'break-word' and space < 0:
+    if space < 0 and (overflow_wrap == 'anywhere' or
+                      (overflow_wrap == 'break-word' and not minimum)):
         # Is it really OK to remove hyphenation for word-break ?
         hyphenated = False
         # TODO: Modify code to preserve W3C condition: