Move the mouse on the button to reveal the shortcut.
<button class="btn btn-primary btn-lg btn-block" ng-click="toastr.success('Action 1')" mk-shortcut="ctrl + enter" mk-hint="title" mk-hint-title="Be faster using the % shortcut">Test button 1</button>
By default, F3 key should trigger the browser find tool.
<button class="btn btn-primary btn-lg btn-block" ng-click="toastr.info('Action 2')" mk-shortcut="F3" mk-hint="inline">Test button 2</button>