how to remove the dotted line around the clicked a element in html

Question

I found that if there is a a link in the page which does not link to a new page,then when user click it,there will be a dotted line around the element,it will only disappear when user click anything else in the page,how to remove this?

Example:

Note the dotted line around the element Section 2.

Answer 1

Use outline:none to anchor tag class

Answer 2

Like @Lo Juego said, read the article

a, a:active, a:focus {    outline: none; }