I\'ve thoroughly searched through both StackOverflow and Google, but come up empty. So apologies in advance if this has been asked & resolved already.
NB
for bootstrap v3.3.2 you find these lines on bootstrap.js
$tip
.detach()
.css({ top: 0, left: 0, display: 'block' })
.addClass(placement)
.data('bs.' + this.type, this)
Then you add this line
.addClass(this.$element.attr("data-class"))
Now to add a class on your popover element, you will be just putting an attribute
data-class="classexemple" then everything works perfect
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