Refer from http://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_ref_js_tab_show&stacked=h
In the <div class="tab-content">, if I add "fade in" class to the first tab content, add "fade" class to second and so on tabs to gain the "fading" effect when switching tabs. Like this:
`
HOME
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
<div id="menu1" class="tab-pane fade">
<h3>Menu 1</h3>
<p>Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>
`
It works on large size of browser, but if I resize the browser to smaller screen, then toggle some tabs in the responsive interface, then resize the screen back to large size, at this time, the "fading" effect is lost.
`
HOME
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.