Ideographic, common characters only on first line
Test passes if you see a single line with no spaces after the last digit.
Assertion: The source text [10 common characters + line break + ideographic characters] will display as a single line with no whitespace.
The assumptions this test makes about expected behaviour are based on the white-space processing rules described in CSS3. During line break transformation, one side is neutral and the other East Asian, so the line break is removed.