How to make certain text not selectable with CSS [duplicate]

The CSS below stops users from being able to select text.

To target IE9 downwards the html attribute unselectable must be used instead:

-webkit-user-select: none; /* Safari */        
-moz-user-select: none; /* Firefox */
-ms-user-select: none; /* IE10+/Edge */
user-select: none; /* Standard */

To target IE9 downwards the html attribute unselectable must be used instead:

<p unselectable="on">Test Text</p>