Tests FontFaceSet#check() returns true for platform fonts

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS document.fonts.check('10px Arial'); is true
PASS document.fonts.check('10px Nonexistent'); is false
PASS document.fonts.check('10px sans-serif'); is true
PASS document.fonts.check('10px Nonexistent, monospace'); is true
PASS document.fonts.check('10px Nonexistent1, Nonexistent2'); is false
PASS successfullyParsed is true

TEST COMPLETE