Which part of the box model does the outline property belong to?

Question

Which part of the box model does the outline property belong to? Is the outline css property part the margin?

Answer 1

The outline property is not part of the CSS Box Model.

18.4 Dynamic outlines: the outline property

• Outlines do not take up any space.

• The outline created with the outline properties is drawn "over" a box, i.e., the outline is always on top, and does not influence the position or size of the box, or of any other boxes.

• Since the outline does not affect formatting (i.e., no space is left for it in the box model), it may well overlap other elements on the page.