The width attribute defines the horizontal length of an element in the user coordinate system.
You can use this attribute with the following SVG elements:
<feBlend><feColorMatrix><feComponentTransfer><feComposite><feConvolveMatrix><feDiffuseLighting><feDisplacementMap><feDropShadow><feFlood><feGaussianBlur><feImage><feMerge><feMorphology><feOffset><feSpecularLighting><feTile><feTurbulence><filter><foreignObject><image><mask><pattern><rect><svg><use>