ReadonlywThe DOMPointReadOnly interface's w property holds the point's perspective value, w, for a read-only point in space.
ReadonlyxThe DOMPointReadOnly interface's x property holds the horizontal coordinate, x, for a read-only point in space. This property cannot be changed by JavaScript code in this read-only version of the DOMPoint object.
ReadonlyyThe DOMPointReadOnl**y** interface's y property holds the vertical coordinate, y, for a read-only point in space.
ReadonlyzThe DOMPointReadOnly interface's z property holds the depth coordinate, z, for a read-only point in space.
The matrixTransform() method of the DOMPointReadOnly interface applies a matrix transform specified as an object to the DOMPointReadOnly object, creating and returning a new DOMPointReadOnly object. Neither the matrix nor the point are altered.
Optionalmatrix: DOMMatrixInitThe DOMPointReadOnly method toJSON() returns an object giving the JSON form of the point object.
The
DOMPointReadOnlyinterface specifies the coordinate and perspective fields used by DOMPoint to define a 2D or 3D point in a coordinate system.MDN Reference