Bootstrap 3 tabs and open first tab on page load

Remove the fade class from the first tab's content..

<div id="tab_a" class="tab-pane active">
    Tab A inner
</div>

http://bootply.com/129046

And working version with the fade

<div id="tab_a" class="tab-pane active fade in">
    Tab A inner
</div>

Baghoo - Thanks for pointing me to what is causing issue

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