The .caret class creates a caret arrow icon (), . So, if we want to show the hidden div, we need to get rid of the .hidden class of Twitter Bootstrap, so we get rid of the important statements, but if we hide it again, we want to have the .hidden class back again! Form control which supports multiple lines of text. What should I do? You can disable zooming capabilities on mobile devices by adding user-scalable=no to the viewport meta tag. Found inside – Page 285