There’s some new units I was totally unaware of from the Level 4 spec for CSS values! The lh unit is “equal to the computed value of line-height” and rlh is the same only of the root element (probably the <html> element) rather than the current element.

Why would that be useful? Šime Vidas’ has a strong point:

“Vertical Inline Centering” of an icon
.inline-icon {
  display: inline-block;
  width: 1lh;
  height: 1lh;
}



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