	leading text, tab-size in px.
	leading text, tab-size in em.
	leading text, tab-size in spaces.
	leading text, tab-size in fraction.
leading text	trailing text, tab-size in px.
leading text	trailing text, tab-size in em.
leading text	trailing text, tab-size in spaces.
leading text	trailing text, tab-size in fraction.
Some spaces... '         ' ... for size reference.
A space... ' ' ... for size reference.
'leading text', for size reference.

PASS Test tab-size measurements