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The <number>
CSS data type represents a number, either integer or fractional. Its syntax extends the one of the <integer>
data value. To represent a fractional value, add the fractional part — a '.' followed by one or several decimal digits — to any <integer>
data value. Like for <integer>
data type, there isn't any unit associated to a <number>
, which is not a CSS dimension.
Interpolation
Values of the <number>
CSS data type can be interpolated in order to allow animations. In that case they are interpolated as real, floating-point, numbers. The speed of the interpolation is determined by the timing function associated with the animation.
Examples
These are valid number values:
12 A raw <integer> is also a <number> 4.01 A positive non-integer <number> -456.8 Negative non-integer <number> 0.0 Zero +0.0 Zero, with a leading + -0.0 Zero, with a leading - (Though strange, this is an allowed value) .60 Digits are optional before the dot 10e3 The scientific notation is allowed -3.4e-2 Most complex case of scientific notation
These are invalid number values:
12. The dot should be followed by a number +-12.2 Only one leading +/- is allowed 12.1.1 Only one dot is allowed
Specifications
Specification | Status | Comment |
---|---|---|
CSS Values and Units Module Level 3 The definition of '<number>' in that specification. |
Candidate Recommendation | No significant change from CSS Level 2 (Revision 1) |
CSS Level 2 (Revision 1) The definition of '<number>' in that specification. |
Recommendation | Explicitly defined |
CSS Level 1 The definition of '<number>' in that specification. |
Recommendation | Implicitly defined |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 1.0 | 1.0 (1.0) | 5.0 | (Yes) | 1.0 (85) |
Scientific notation | 43.0 | 29 | 11 | ? | ? |
Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Scientific notation | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |