Vertical Rhythm with Ems and Rems  Posted on by Jay  First off,
there are already some tutorials on creating vertical Rhythm,
most noticeably by Harry Roberts in his articles Single
Direction Margins and Measuring and Sizing UIs and Richard
Rutter’s 2006 article Compose to a Vertical Rhythm. I mostly
wanted to expand on these and cover a few different examples,
and more importantly some gotchas that stopped me picking this
up as quickly as I should have. But first off, maybe you’ve
arrived here as a skeptic. Maybe you’re scoffing pixel pies and
laughing at the complicated em-based maths you’ll find here.
Well, maybe I wasn’t ever that cynical, but I certainly put off
looking at ems for a long time…  My Background  I’ve long
resisted moving from Pixels to Ems. I was in the ‘I could do
without the maths’ camp.  That’s not to say I was dogmatic about
ems; I could appreciate the advantage of bumping font sizes in
one go. But being frank I would rather change multiple fixed
font sizes than figure out all the maths