html - Why some characters overflow a line despite using font-size == line-height? - 


<div style="height:40px; line-height:40px; width:40px; font-size: 40px; font-family: sans-serif; background-color:rgb(220,220,220)">    ⇪  <div>

running snippet on chrome, macos sierra, displays:

enter image description here

notice arrow overflows div. thought never happen. why?

because font-size not define height of glyph, height of em-square. normal in fonts glyphs taller em-square.

every font has em-square size , ascent , descent. glyph typically fit between distance top of ascent , bottom of descent, distance larger em-square size.


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