title: rem on mobile and desktop devices?
body: <p>I noticed that the font size on mobile and desktop devices are different. I measured the real size of the letter 'T' with a size of 2 rem with a ruler. On my laptop the big 'T' is 6 mm high and on my tablet as well as on my smartphone the 'T' is 4 mm high. I also checked multiple browsers and got the same result.</p>
  <p>Shouldn't they be the same height on all devices?</p>