Function unionRect

unionRect(r1, r2): {
    height: number;
    left: number;
    top: number;
    width: number;
}
Parameters
- r1: any
- r2: any
Returns {
    height: number;
    left: number;
    top: number;
    width: number;
}
- height: number
- left: number
- top: number
- width: number