Ideographic, spaces at beginning and end of line
Test passes if you see a single line with a single space after the character 行.
Assertion: The source text [ideographic characters + 3 spaces + line break + spaces + ideographic characters] will display as a single line with a single space before the second run of ideographic text.
The assumptions this test makes about expected behaviour are based on the white-space processing rules described in CSS3. This is merely a combination of the previous tests, but since the second line starts with more than 4 space characters, it also checks that space removal is done before line break transformation for implementations that only look at 4 characters either side of the line break to establish context.