Dynamic-Outlines (e.g. :focus {outline:color}) | CSS 2.1 Spec: W3C
Much like the border property, the outline property will create a line surrounding the element— however, the main remarkable difference is that Outline unlike border does not take up screen real-estate (it doesn’t cause the ‘outlined element’ to get wider and taller as would adding a border property. 18.4 Dynamic outlines: the ‘outline’ property At…