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sin()

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The sin() CSS function is a trigonometric function that returns the sine of a number, which is a value between -1 and 1. The function contains a single calculation that must resolve to either a <number> or an <angle> by interpreting the result of the argument as radians. That is, sin(45deg), sin(0.125turn), and sin(3.14159 / 4) all represent the same value, approximately 0.707.

Syntax

/* Single <angle> values */
width: calc( sin(45deg) * 100px );
width: calc( sin(0.25turn) * 100px );
width: calc( sin(1.0471967rad) * 100px );

/* Single <number> values */
width: calc( sin(63.673) * 100px );
width: calc( sin(2 * 0.125) * 100px );

/* Other values */
width: calc( sin(pi / 2) * 100px );
width: calc( sin(e / 4) * 100px );

The sin() function takes only one expression as its argument.

Formal syntax

<sin()> = 
  sin( <calc-sum> )  

<calc-sum> = 
  <calc-product> [ [ '+' | '-' ] <calc-product> ]*  

<calc-product> = 
  <calc-value> [ [ '*' | '/' ] <calc-value> ]*  

<calc-value> = 
  <number>         |
  <dimension>      |
  <percentage>     |
  <calc-constant>  |
  ( <calc-sum> )   

<calc-constant> = 
  e          |
  pi         |
  infinity   |
  -infinity  |
  NaN

Examples

Boxes Size

For example, when creating a 100x100 box based on external parameters, in this case sin(90deg). Thus sin(90deg) will return 1 making the box 100px width and 100px height.

div {
  background-color: red;
  width: calc( sin(90deg) * 100px );
  height: calc( sin(90deg) * 100px );
}

Controlling Animation Duration

Another use-case is to control the animation-duration. Reducing duration based on the sine value. In this case, the animation duration will be 1s.

div {
  animation-name: myAnimation;
  animation-duration: calc( sin(0.25turn) * 1s );
}

Specifications

Specification
CSS Values and Units Module Level 5 # trig-funcs

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`sin`	No	No	103	No	No	15.4	No	No	No	No	15.4	No