20% 253pt 12pt 16px 1em (12pt) 10em 10em (10.5pt) 20% 252pt 336px 50.4em 251.7em 100% 20em (5pt) 20em (8pt) 100pt (5pt) 100pt (8pt) 100px (5pt) 100px (8pt) 20% (5pt) 20% (8pt)