The CSS tan() function returns the tangent of a specified angle in radians. In other words, it returns the ratio of the length of the opposite side to the length of the adjacent side in a right triangle. The value of the tangent will range between −infinity and infinity.
Syntax of CSS type tan():
/* angle values */ width: calc(100px * tan(30deg)); width: calc(100px * tan(0.25turn)); width: calc(100px * tan(0.398163rad)); /* number values */ width: calc(100px * tan(0.73502)); width: calc(100px * tan(2.732 – 1)); /* Other values */ width: calc(100px * tan(pi / 4)); width: calc(100px * tan(e / 2));
Parameter: The function takes one parameter:
- angle: A angle value representing the angle in radians for which the tangent should be calculated.
Return value: The return value of the tan() function is a <number> value, representing the tangent of the specified angle.
Example 1: This example illustrates setting the skewness based on the tan value.
<!DOCTYPE html>
<html>
<head>
<style>
.container {
height: 200px;
width: 200px;
background-color: green;
transform: rotate(45deg) skew(20deg) scale(1, tan(20deg));
}
</style>
</head>
<body>
<h1 style="color: green;">
GeeksforGeeks
</h1>
<h2>tan() function</h2>
<div class="container">
</div>
</body>
</html>
Output:
Example 2: This example illustrates the use of the tan() function to set the left of the element.
<!DOCTYPE html>
<html>
<head>
<style>
.box {
width: 100px;
height: 100px;
background-color: green;
position: absolute;
top: 50px;
left: calc(30% + 50px * tan(30deg));
}
</style>
</head>
<body>
<h1 style="color: green;">
GeeksforGeeks
</h1>
<h2>tan() function</h2>
<div class="box">
GeeksforGeeks
</div>
</body>
</html>
Output:
Supported browsers: The browsers supported by the tan() function are listed below:
- Firefox 16.0
- Safari 15.4