The perspective-origin CSS property is used in 3D transformations to control the origin or point of view for perspective effects. It specifies the position at which the viewer is looking at the 3D transformed elements.

The perspective-origin property accepts two values, representing the horizontal and vertical position of the perspective origin, respectively. These values can be specified using length units (such as pixels or percentages) or keywords.

Here’s an example:

.box {
  perspective: 1000px;
  perspective-origin: 50% 50%;

In this example, the .box class sets a perspective of 1000px using the perspective property. The perspective-origin: 50% 50%; rule specifies that the perspective origin is positioned at the center of the element horizontally and vertically.

By adjusting the values of perspective-origin, you can change the viewer’s perspective point and affect how the 3D transformed elements are perceived. Moving the origin horizontally or vertically can create different visual effects and alter the depth perception of the transformed elements.

It’s important to note that perspective-origin works in conjunction with the perspective property, which establishes the depth of the 3D space. Together, they allow you to create realistic 3D transformations and control the viewer’s perspective.

The perspective-origin property is primarily used in CSS 3D transforms to manipulate the position from which the transformed elements are viewed, adding depth and realism to the visual representation.