I've been delving into the concepts of fixed, fluid, and responsive web page design. One of the resources I stumbled upon is this article about fixed vs. fluid layouts. In the article, it mentions that "A fixed website layout has a wrapper that is a fixed width, and the components inside it have either percentage widths or fixed widths." This statement about fixed layouts having the potential for percentage widths has left me a bit confused. Isn't using percentage widths characteristic of a fluid layout? Isn't it what defines a layout as fluid? I'd appreciate it if someone could clarify this for me.