SVGRect represents a rectangle. Rectangles consist of an x and y coordinate pair identifying a minimum x value, a minimum y value, and a width and height, which are constrained to be non-negative.
This represents the width of the rectangle.A value that is negative results to an error. A value of zero disables rendering of the element
The exact effect of this coordinate depends on each element. If the attribute is not specified, the effect is as if a value of
0 were specified.