What is the difference between border and outline in CSS?

:) Border is created inside the element, where as outline is created outside the element. So border is computed along with the width and height of the element, while outline draws outside the element. From W3 School Site The CSS border properties allow you to specify the style and color of an element's border.

Do borders and outlines need a style?

Both borders and outlines need a style to work. There are ten available styles to choose from, including borders that don't show up at all. Borders share the same styles with outlines, only with outline-style set as the property. Outlines and borders are great design tools for website creators.

How many sides can an outline be on?

The above shorthand could have been written: outline-width: 1px; outline-style: dashed; outline-color: red; You can’t set an outline on just one (or two, or three) sides of an elements. All sides only. There is no such thing as outline-top, outline-right, outline-bottom, or outline-left like there is with border.