This test checks font stretches.

font-family="serif" font-stretch not given font-family="serif" font-stretch="ultra-condensed" font-family="serif" font-stretch="narrower" font-family="serif" font-stretch="extra-condensed" font-family="serif" font-stretch="condensed" font-family="serif" font-stretch="semi-condensed" font-family="serif" font-stretch="normal" font-family="serif" font-stretch="semi-expanded" font-family="serif" font-stretch="expanded" font-family="serif" font-stretch="extra-expanded" font-family="serif" font-stretch="ultra-expanded" font-family="serif" font-stretch="wider" font-family="serif" font-stretch="narrower" font-family="serif" font-stretch="wider"