PASS test('test1a', 'margin-left') is "0px"
PASS test('test1b', 'margin-left') is "0px"
PASS test('test2a', 'margin-left') is "5px"
PASS test('test2b', 'margin-left') is "5px"
PASS test('test3a', 'margin-left') is "10px"
PASS test('test3b', 'margin-left') is "10px"
Test that the matched declaration cache handles explicitly inherited properties correctly.