diff --git a/geometry-dom/geometry-dom-tests.ts b/geometry-dom/geometry-dom-tests.ts
new file mode 100644
index 000000000..e29366511
--- /dev/null
+++ b/geometry-dom/geometry-dom-tests.ts
@@ -0,0 +1,25 @@
+/// <reference path="./geometry-dom.d.ts" />
+
+var point = new DOMPoint(5, 4);
+var matrix = new DOMMatrix(2, 0, 0, 2, 10, 10);
+var transformedPoint = point.matrixTransform(matrix);
+
+var point = new DOMPoint(2, 0);
+var quad1 = new DOMQuad(point, {x: 12, y: 0}, {x: 2, y: 10}, {x: 12, y: 10});
+
+var rect = new DOMRect(2, 0, 10, 10);
+var quad2 = new DOMQuad(rect);
+
+new DOMQuad({x: 40, y: 25}, {x: 180, y: 8}, {x: 210, y: 150}, {x: 10, y: 180});
+
+var matrix = new DOMMatrix();
+matrix.scaleSelf(2);
+matrix.translateSelf(20,20);
+
+var matrix = new DOMMatrix();
+matrix.translateSelf(20, 20);
+matrix.scaleSelf(2);
+matrix.translateSelf(-20, -20);
+
+var matrix = new DOMMatrix();
+matrix.translateSelf(20, 20).scaleSelf(2).translateSelf(-20, -20);
diff --git a/geometry-dom/geometry-dom.d.ts b/geometry-dom/geometry-dom.d.ts
new file mode 100644
index 000000000..9058bf87d
--- /dev/null
+++ b/geometry-dom/geometry-dom.d.ts
@@ -0,0 +1,326 @@
+// Type definitions for Geometry Format Specification
+// Project: http://www.w3.org/TR/geometry-1/
+// Definitions by: Toshiya Nakakura <https://github.com/nakakura>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module GeometryDom {
+    export interface DOMPointReadOnly {
+        /**
+         * x coordinate / readonly
+         */
+        x: number;
+        /**
+         * y coordinate / readonly
+         */
+        y: number;
+        /**
+         * z coordinate / readonly
+         */
+        z: number;
+        /**
+         * w coordinate / readonly
+         */
+        w: number;
+
+        /**
+         * Post-multiply point with matrix.
+         * @param matrix
+         */
+        matrixTransform(matrix:DOMMatrixReadOnly): DOMPoint;
+    }
+
+    interface DOMPoint extends DOMPointReadOnly {
+        /**
+         * x coordinate
+         */
+        x: number;
+        /**
+         * y coordinate
+         */
+        y: number;
+        /**
+         * z coordinate
+         */
+        z: number;
+        /**
+         * w coordinate
+         */
+        w: number;
+    }
+
+    interface DOMRect extends DOMRectReadOnly {
+        /**
+         * x coordinate
+         */
+        x: number;
+        /**
+         * y coordinate
+         */
+        y: number;
+        /**
+         * width value
+         */
+        width: number;
+        /**
+         * height value
+         */
+        height: number;
+    }
+
+    interface DOMRectReadOnly {
+        /**
+         * x coordinate
+         */
+        x: number;
+        /**
+         * y coordinate
+         */
+        y: number;
+        /**
+         * width value
+         */
+        width: number;
+        /**
+         * height value
+         */
+        height: number;
+        /**
+         * min(y coordinate, y coordinate + height dimension)
+         */
+        top: number;
+        /**
+         * max(x coordinate, x coordinate + width dimension)
+         */
+        right: number;
+        /**
+         * max(y coordinate, y coordinate + height dimension)
+         */
+        bottom: number;
+        /**
+         * min(x coordinate, x coordinate + width dimension)
+         */
+        left: number;
+    }
+
+    interface DOMRectList {
+        /**
+         * total number of DOMRect objects associated with the object.
+         * readonly unsigned long length
+         */
+        length: number;
+        /**
+         * the DOMRect object at index must be returned.
+         * @param index
+         */
+        item(index: number): DOMRect;
+    }
+
+    interface DOMQuad {
+        /**
+         * a DOMPoint that represents p1 of the quadrilateral
+         */
+        p1: DOMPoint;
+        /**
+         * a DOMPoint that represents p2 of the quadrilateral
+         */
+        p2: DOMPoint;
+        /**
+         * a DOMPoint that represents p3 of the quadrilateral
+         */
+        p3: DOMPoint;
+        /**
+         * a DOMPoint that represents p4 of the quadrilateral
+         */
+        p4: DOMPoint;
+        /**
+         * the associated bounding rectangle of the quadrilateral
+         */
+        bounds: DOMRectReadOnly;
+    }
+
+    interface DOMMatrixReadOnly {
+        /**
+         * These attributes are simple aliases for certain elements of the 4x4 matrix
+         */
+        a: number;
+        b: number;
+        c: number;
+        d: number;
+        e: number;
+        f: number;
+
+        m11: number;
+        m12: number;
+        m13: number;
+        m14: number;
+        m21: number;
+        m22: number;
+        m23: number;
+        m24: number;
+        m31: number;
+        m32: number;
+        m33: number;
+        m34: number;
+        m41: number;
+        m42: number;
+        m43: number;
+        m44: number;
+
+        is2D: boolean;
+        isIdentity: boolean;
+
+        translate(tx: number, ty: number, tz?: number): DOMMatrix;
+        scale(scale: number, originX?: number, originY?: number): DOMMatrix;
+        scale3d(scale: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+        scaleNonUniform(scale: number, scaleX: number, scaleY: number, scaleZ: number, originX: number, originY: number, originZ: number): DOMMatrix;
+        rotate(angle: number, originX?: number, originY?: number): DOMMatrix;
+        rotateFromVector(x: number, y: number): DOMMatrix;
+        rotateAxisAngle(x: number, y: number, z: number, angle: number): DOMMatrix;
+        skewX(sx: number): DOMMatrix;
+        skewY(sx: number): DOMMatrix;
+
+        multiply(other: DOMMatrix): DOMMatrix;
+        flipX(): DOMMatrix;
+        flipY(): DOMMatrix;
+        inverse(): DOMMatrix;
+
+        transformPoint(point?: DOMPointInit): DOMPoint;
+
+        toFloat32Array(): Array<number>;
+        toFloat64Array(): Array<number>;
+    }
+
+    interface DOMMatrix extends DOMMatrixReadOnly {
+        a: number;
+        b: number;
+        c: number;
+        d: number;
+        e: number;
+        f: number;
+
+        m11: number;
+        m12: number;
+        m13: number;
+        m14: number;
+        m21: number;
+        m22: number;
+        m23: number;
+        m24: number;
+        m31: number;
+        m32: number;
+        m33: number;
+        m34: number;
+        m41: number;
+        m42: number;
+        m43: number;
+        m44: number;
+
+
+        multiplySelf(other: DOMMatrix): DOMMatrix;
+        preMultiplySelf(other: DOMMatrix): DOMMatrix;
+        translateSelf(tx: number, ty: number, tz?: number): DOMMatrix;
+        scaleSelf(scale: number, originX?: number, originY?: number): DOMMatrix;
+        scale3dSelf(scale: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+        scaleNonUniformSelf(scaleX: number, scaleY?: number, scaleZ?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+        rotateSelf(angle: number, originX?: number, originY?: number): DOMMatrix;
+        rotateFromVectorSelf(x: number, y: number): DOMMatrix;
+        rotateAxisAngleSelf(x: number, y: number, z: number, angle: number): DOMMatrix;
+
+        skewXSelf(sx: number): DOMMatrix;
+        skewYSelf(sy: number): DOMMatrix;
+        invertSelf(): DOMMatrix;
+        setMatrixValue(transformList: DOMMatrix): DOMMatrix;
+    }
+}
+
+declare var DOMPointReadOnly: {
+    prototype: GeometryDom.DOMPointReadOnly;
+    new (x: number, y: number, z: number, w: number): GeometryDom.DOMPointReadOnly;
+};
+
+declare var DOMPoint: {
+    prototype: GeometryDom.DOMPoint;
+    new (x?:number, y?:number, z?:number, w?:number): GeometryDom.DOMPoint;
+};
+
+interface DOMPointInit {
+    /**
+     * x coordinate: 0
+     */
+    x: number;
+    /**
+     * y coordinate: 0
+     */
+    y: number;
+    /**
+     * z coordinate: 0
+     */
+    z?: number;
+    /**
+     * w coordinate: 1
+     */
+    w?: number;
+}
+
+declare var DOMRect: {
+    prototype: GeometryDom.DOMRect;
+    new (x: number, y: number, width: number, height: number): GeometryDom.DOMRect;
+};
+
+declare var DOMRectReadOnly: {
+    prototype: GeometryDom.DOMRectReadOnly;
+    new (x: number, y: number, width: number, height: number): GeometryDom.DOMRectReadOnly;
+};
+
+interface DOMRectInit {
+    /**
+     * x coordinate
+     */
+    x: number;
+    /**
+     * y coordinate
+     */
+    y: number;
+    /**
+     * width value
+     */
+    width: number;
+    /**
+     * height value
+     */
+    height: number;
+}
+
+interface DOMRectList {
+    /**
+     * total number of DOMRect objects associated with the object.
+     * readonly unsigned long length
+     */
+    length: number;
+    /**
+     * the DOMRect object at index must be returned.
+     * @param index
+     */
+    item(index: number): GeometryDom.DOMRect;
+}
+
+declare var DOMQuad: {
+    prototype: GeometryDom.DOMQuad;
+    new (rect?: DOMRectInit): GeometryDom.DOMQuad;
+    new (p1?: DOMPointInit, p2?: DOMPointInit, p3?: DOMPointInit, p4?: DOMPointInit): GeometryDom.DOMQuad;
+};
+
+declare var DOMMatrixReadOnly: {
+    prototype: GeometryDom.DOMMatrixReadOnly;
+    new (numberSequence: Array<number>): GeometryDom.DOMMatrixReadOnly;
+};
+
+declare var DOMMatrix: {
+    prototype: GeometryDom.DOMMatrix;
+    new (): GeometryDom.DOMMatrix;
+    new (transformList: string): GeometryDom.DOMMatrix;
+    new (other: GeometryDom.DOMMatrixReadOnly): GeometryDom.DOMMatrix;
+    new (array: Array<number>): GeometryDom.DOMMatrix;
+    new (a: number, b: number, c: number, d: number, e: number, f: number): GeometryDom.DOMMatrix;
+};
+