Firstly they’re there for for accessibility reasons. To denote for people who don’t use a mouse to visualise which area is active. To select an area they will use the “enter (return key)” whilst using the cursor keys to navigate.
CSS tricks has a little more on “removing the dotted line on links”
In the image above you can see the visual problem whereby there‘s a rather unsightly dotted line around facebook icon graphic. To remove this use the css below.
a:focus {
outline: none;
}
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