I am using 
to break line inside bootstrap popover data-content
attribute but it doesn't work. How is that possible?
Also is that possible to make some bold content in it?
$(document).ready(function(){
$('[data-toggle="popover"]').popover();
});
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script></script>
<div class="container">
<a href="#" title="Header" data-toggle="popover" data-trigger="hover" data-content="Hello, i need 
 to break line.">hover me</a>
</div>
$(document).ready(function(){
$('[data-toggle="popover"]').popover();
});
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script></script>
<div class="container">
<a href="#" title="Header" data-toggle="popover" data-trigger="hover" data-content="Hello, i need <br /> to break line.<b>BOLD HERE</b>" data-html="true">hover me</a>
</div>
Use data-html="true"
and <br/>