H1
H2
H3
H4
H5
H6
font-size:1rem
font-size:1.5rem
font-size:2rem
font-size:1em
font-size:1.5em
font-size:2em
div with 64px base font - contains rem
font-size:1rem
font-size:1.5rem
font-size:2rem
div with 64px base font - contains em
font-size:1em
font-size:1.5em
font-size:2em
font-size: 16pt
font-size: 32pt
font-size: 64pt