<percentage> - CSS: Cascading Style Sheets 编辑

The <percentage> CSS data type represents a percentage value. It is often used to define a size as relative to an element's parent object. Numerous properties can use percentages, such as width, height, margin, padding, and font-size.

Note: Only calculated values can be inherited. Thus, even if a percentage value is used on the parent property, a real value (such as a width in pixels for a <length> value) will be accessible on the inherited property, not the percentage value.

Syntax

The <percentage> data type consists of a <number> followed by the percentage sign (%). Optionally, it may be preceded by a single + or - sign, although negative values are not valid for all properties. As with all CSS dimensions, there is no space between the symbol and the number.

Interpolation

When animated, values of the <percentage> data type are interpolated as real, floating-point numbers. The speed of the interpolation is determined by the timing function associated with the animation.

Examples

Width and margin-left

<div style="background-color:navy;">
  <div style="width:50%; margin-left:20%; background-color:chartreuse;">
    Width: 50%, Left margin: 20%
  </div>
  <div style="width:30%; margin-left:60%; background-color:pink;">
    Width: 30%, Left margin: 60%
  </div>
</div>

The above HTML will output:

Font-size

<div style="font-size:18px;">
  <p>Full-size text (18px)</p>
  <p><span style="font-size:50%;">50% (9px)</span></p>
  <p><span style="font-size:200%;">200% (36px)</span></p>
</div>

The above HTML will output:

Specifications

Specification	Status	Comment
CSS Values and Units Module Level 4 The definition of '<percentage>' in that specification.	Editor's Draft	No significant change.
CSS Values and Units Module Level 3 The definition of '<percentage>' in that specification.	Candidate Recommendation	No significant change from CSS Level 2 (Revision 1).
CSS Level 2 (Revision 1) The definition of '<percentage>' in that specification.	Recommendation	No change from CSS Level 1.
CSS Level 1 The definition of '<percentage>' in that specification.	Recommendation	Initial definition.

Browser compatibility

BCD tables only load in the browser

See also

• <length-percentage>
• CSS Values and Units