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rotateX()

The rotateX()CSS function defines a transformation that moves the element around the abscissa without deforming it. The amount of movement is defined by the specified angle; if positive, the movement will be clockwise, if negative, it will be counter-clockwise.

The axis of rotation passes by the origin, defined by transform-origin CSS property.

rotateX(a)is a shorthand for rotate3D(1, 0, 0, a).

In opposition to rotations in the plane, the composition of 3D rotations is usually not commutative; it means that the order in which the rotations are applied is crucial.

Syntax

rotateX(a)

Values

a: Is an <angle> representing the angle of the rotation. A positive angle denotes a clockwise rotation, a negative angle a counter-clockwise one.

Cartesian coordinates on ℝ²	Homogeneous coordinates on ℝℙ²	Cartesian coordinates on ℝ³	Homogeneous coordinates on ℝℙ³
This transform applies to the 3D space and cannot be represented on the plane.		$(\begin{matrix} 1 & 0 & 0 \\ 0 & cos(a) & -sin(a) \\ 0 & sin(a) & cos(a) \end{matrix})$	$(\begin{matrix} 1 & 0 & 0 & 0 \\ 0 & cos(a) & -sin(a) & 0 \\ 0 & sin(a) & cos(a) & 0 \\ 0 & 0 & 0 & 1 \end{matrix})$

Examples

HTML

<p>foo</p>
<p class="transformed">bar</p>

CSS

p { 
  width: 50px;
  height: 50px;
  background-color: teal;
}

.transformed{
  transform: rotateX(45deg);
  background-color: blue;
}

Result

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https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/rotateX