user-select

The user-select CSS property controls whether the user can select text. This doesn’t have any effect on content loaded as part of a browser’s user interface (its chrome), except in textboxes.

Values: none The text of the element and its sub-elements is not selectable. Note that the Selection object can contain these elements. auto The used value of auto is determined as follows: On the ::before and ::after pseudo elements, the used value is none If the used value of user-select on the parent of this element is none, the used value is none Otherwise, if the used value of user-select on the parent of this element is all, the used value is all Otherwise, the used value is text

Syntax example: user-select: none;