Geometry interfaces

Geometry interfaces is a CSS module that provides interfaces for working with 3D and 2D graphics — in particular, for working with points, rectangles, quadrilaterals and transformation matrices (for operations that translate/move, scale, rotate, skew/shear/slant, and flip graphics, as well as for multiplying/chaining and inverting/undoing those operations).

As a web developer, you don't always use the geometry interfaces directly, but instead use other features that rely on them behind the scenes: parts of CSS Transforms, the Canvas API, the WebXR Device API, and (more directly) VideoFrame.visibleRect, Element.getClientRects(), and Element.getBoundingClientRect().

Interfaces

DOMMatrix: Represents a transformation matrix, for operations that translate/move, scale, rotate, skew/shear/slant, and flip graphics, as well as for multiplying/chaining and inverting/undoing those operations.
DOMMatrixReadOnly: Read-only version of DOMMatrix.
DOMPoint: Represents a 2D or 3D point in a coordinate system; it includes values for the coordinates in up to three dimensions, as well as an optional perspective value.
DOMQuad: Represents a collection of four DOMPoint objects defining the corners of a quadrilateral.
DOMRect: Represents the size and position of a rectangle.
DOMRectReadOnly: Read-only version of DOMRect.

Examples

The Path2D.addPath() and CanvasPattern.setTransform() articles have examples that use some of the geometry interfaces.

Specifications

Specification
Geometry Interfaces Module Level 1 # DOMMatrix
Geometry Interfaces Module Level 1 # DOMPoint
Geometry Interfaces Module Level 1 # DOMQuad
Geometry Interfaces Module Level 1 # DOMRect