CSS Reference

"font-size" - css property (v. css 1)

  • To specify the font size of a text.
  • Initial value: medium
  • The property is inherited
  • HTML usage: all elements
  • Browsers that support the font-size - property :
    Internet Explorer Mozilla Firefox Opera Google Chrome Apple Safari

Possible font-size values:

value Comments CSS
absolute-size A keyword representing an index to a table of font sizes computed and kept by the UA. Possible values are:
xx-small | x-small | small | medium | large | x-large | xx-large
1
relative-size A keyword is interpreted relative to the table of font sizes and the font size of the parent element. Possible values are:
larger | smaller
1
length With this you specify a positive value (it cannot be negative) for the size followed with a unit identifier. 1
percentage With this you specify a positive value (it cannot be negative) with a percentage. Refer to parent element's font size . 1
inherit Will inherit the value from parent specification. This property value is new with CSS 2. 2

Possible unit identifier:

unit identifier Comments CSS
em The relative unit 'em' is relative to the font size of the element itself. 1
ex The relative unit 'ex' is relative to the font size of the element itself. 1
px Pixels, relative to the viewing device 1
in inches -> 1 inch is equal to 2.54 centimeters. 1
cm centimeters. 1
mm millimeters. 1
pt points -> the points used by CSS2 are equal to 1/72th of an inch. 1
pc picas -> 1 pica is equal to 12 points. 1

Property "font-size" example:

<!DOCTYPE HTML >
<html  >
  <head>
    <title>Test</title>
    <style type="text/css">
      div {border: blue 1px solid; color:black;
           padding: 4px 4px 4px 4px; width: 400px;
      }
      .absolute { font-size: x-large; }
      .relative { font-size: larger; }
      .length { font-size: 24px; }
      .percentage { font-size: 140%; }
    </style>
  </head>
  <body style="font-size: 14px;" >
    <br>Starting with 14px
    <br>absolute-> font-size: x-large; <br>
    <div class="absolute" >
      A keyword representing an index to a
      table of font sizes computed and kept by the UA.
    </div>
    <br>relative-> font-size: larger;<br>
    <div class="relative" >
      A keyword is interpreted relative to the table
      of font sizes and the font size of the parent element.
    </div>
    <br>font-size: 24px;<br>
    <div class="length" >
      With this you specify a positive value for
      the size followed with a unit identifier.
    </div>
    <br>font-size: 140%;<br>
    <div class="percentage" >
      With this you specify a positive value with
      a percentage. It is related to the present font.
    </div>
  </body>
</html>

Javascript access:

// To SET values ([o] is the target object)
[o].style.fontSize="font-size values"
// To GET values you must first get the computed style object
// To get that object in IE or Opera:
var cStyle=[o].currentStyle;
// To get that object in Firefox, Chrome or Safari (w3c-type):
var cStyle=window.getComputedStyle([o],null)
// To GET the property value:
var value=cStyle.fontSize;
// IE and Opera will return a value in units as used with a Set.
// Firefox will return a calculated float value in pixel (px).
// Chrome or Safari will return a calculated int value in pixel (px).
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