Bootstrap fixed navbar inside div

Question

In bootstrap documentation they're able to "trap" a .navbar-fixed-top inside their .bs-docs-example div:

<div class="bs-docs-example bs-navbar-top-example">
    <div class="navbar navbar-fixed-top" style="position: absolute;">
        <div class="navbar-inner">
        [...]

But if I do the same in my test page the navbar "escapes" the div and get fixed in the top of the body, not the top of the div. How it's the trick achieved?

Answer 1

<div class="container-fluid">
    <div class="container">
        <nav class="navbar">...</nav>
    </div>
</div>

That works with built-in Bootstrap's CSS.

Answer 2

Ok figured it out. The parent element container must have position: relative, and navbar must have position: absolute, that way if you attach either .navbar-fixed-top or .navbar-fixed-bottom it will get fixed relative to the parent element and NOT relative to the entire page. Yeah!