https://github.com/web-platform-tests/wpt/blob/master/infrastructure/reftest/reftest_match-print-ref.html#L5-L6 specifies a div height of 180px which is supposed to correspond to 2 inches on the printed paper. But a simple calculation of 96 pixels per inch x 2 suggests it ought to be 192px. It's somewhat unclear what accounts for the the other 12px.