Definition and Usage
The <percentage> CSS data types represent a percentage value. Many CSS properties can take percentage values, often to define sizes in terms of parent objects. Percentages are formed by a <number> immediately followed by the percentage sign %. Just as is the case with all other units in CSS, there isn’t a space between the ‘%’ and the number.
Many length properties use percentages, such as width, margin and padding. Percentages can also be seen in font-size, where the size of the text is directly related to the size of its parent.
Note: only calculated values are inherited. So, even if a percentage value is used on the parent property, a real value, like a width in pixel for a <length> value, will be accessible on the inherited property, not the percentage value.
Interpolation
Values of the <percentage> 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
1 | <div style="background-color:#0000FF;"> |
2 | <div style="width:50%;margin-left:20%;background-color:#00FF00;">Width: 50%, Left margin: 20%</div> |
3 | <div style="width:30%;margin-left:60%;background-color:#FF0000;">Width: 30%, Left margin: 60%</div> |
4 | </div> |
Result:
Another example
<div style="font-size:18px;"> Full size text (18px) <span style="font-size:50%;">50%</span> <span style="font-size:200%;">200%</span> </div>
Compatibility
Desktop browsers
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 1.0 | 1.0 (1.0) | <=5.0 | yes | 1.0 (85) |
Mobile browsers
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | yes | yes | yes | yes | yes |
