In the following (very simple) example, I can't get bootstrap's tooltips to show, they just don't work (I get plain vanilla browser toooltips).

<http://codepen.io/anon/pen/zqgaMY>

My A tags have to official bootstrap code:

```
data-toggle="tooltip" data-placement="left" title="Tooltip on left"

```

and I load the JS :

```
$(function () {
  $('[data-toggle="tooltip"]').tooltip()
})

```

What am I doing wrong ?