2014
Jan
09





「pt, px, em, % 」, These properties are the font size of CSS. First, "em" is the same with "%", this is meaning for percentage of font. If you type 50% so that the font will be the 50% size of normal font.

  • 1em=100%=12pt=16px
  • 0.75em=75%=9pt=12px

"pt": The font size for printer.

"px": This unit is meaning pixel.

"em": 1em = 100% = 12pt = 16px = The default size of browser.

It is often 16px in most browser. We could use nested "em" to set the font size. For example, I set 2em to the first div and set 0.5em to the child div. Then the font size of child div will be 2*0.5, it is equal to 1em.

"percent(%)" : It is the same with "em".


1em 100% 12pt 16px
ECAE ECAE ECAE ECAE

Property "pt" 8pt 9pt 10pt 11pt 12pt 13pt 14pt 16pt
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Property "px" 8px 9px 10px 11px 12px 13px 14px 16px
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Property "em" 0.6em 0.8em 1em 1.2em 1.5em 1.6em 2em > 0.5 3em > 0.3
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Property percentage 40% 60% 80% 100% 150% 180% 200% > 50% 300% > 0.3
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