Ideographic, less than 4 spaces at end of line   缔造真正全球通行 的万维网
Assertion: The source text [ideographic characters + 3 spaces +
line break + 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.
The spaces at line end are not removed before line break
transformation (LBT). LBT sees East Asian context on both sides
so removes line break. Remaining spaces are then normalized to
one space.  Next test xhtml5 as xml