From Hydrogenaudio Knowledgebase
This template provides a "clickable button" formatting style for text. This button is not clickable, and care should be taken when using it to avoid readers thinking the result may be. (It has an explanatory tooltip for users hovering over it, but that may not always be displayed, or only displayed after too long a delay, so that it may not show up to people trying to click it.)
The button is styled on the buttons found in Windows 10.