position:sticky does not leave parent - css

Question

How can make an element sticky, so it stays at the top of the viewport? I want the element to remain sticky even if it leaves it's container.
I tried this
HTML
<div class="page">
<div class="parent">
<div class="child-sticky">
<p>i want to be sticky, even when I'm outside my parent.</p>
</div>
</div>
</div>
CSS
.child-sticky {
position:sticky;
top:20px;
}
.page {
height: 3000px;
}
Here's a pen to illustrate the problem. Scroll down to see what I mean.
https://codepen.io/pwkip/pen/OxeMao

Answer 1

Sticky works that way, it will remain sticky relative to its parent. You need to use fixed.
Check this codepen

Answer 2

Already 7 months ago, but I found a CSS only solution if the element you want to be sticky is the last one of its parent, its very simple: Just give the parent element position: sticky; and also give it top: -xx;, depending on the height of the elements before the last one.
#parent {
position: -webkit-sticky;
position: sticky;
top: -3em;
}
#some_content {
height: 3em;
}
#sticky {
background-color: red;
}
#space {
height: 200vh;
}
<div id="parent">
<div id="some_content">Some Content</div>
<div id="sticky">Sticky div</div>
</div>
<div id="space"></div>
<p>Scroll here</p>

Answer 3

This is how position: sticky is intended to work. If you need it to also work outside the parent than you have to change the HTML structure.
See also the official definition: https://www.w3.org/TR/css-position-3/#sticky-pos

Answer 4

There is a little trick you can try.
In some cases it will break your layout and in others it won't. In my case, I have a header with some buttons but when I scroll down, I want to have access to some action buttons which are inside that one-line header. The only change is to set the display property of your parent to be inline.
.parent {
display: inline;
}

Answer 5

Based on https://stackoverflow.com/a/46913147/2603230 and https://stackoverflow.com/a/37797978/2603230's code, here's an combined solution that does not require hard-coded height.
$(document).ready(function() {
// Get the current top location of the nav bar.
var stickyNavTop = $('nav').offset().top;
// Set the header's height to its current height in CSS
// If we don't do this, the content will jump suddenly when passing through stickyNavTop.
$('header').height($('header').height());
$(window).scroll(function(){
if ($(window).scrollTop() >= stickyNavTop) {
$('nav').addClass('fixed-header');
} else {
$('nav').removeClass('fixed-header');
}
});
});
body { margin: 0px; padding: 0px; }
nav {
width: 100%;
background-color: red;
}
.fixed-header {
position: fixed;
top: 0;
left: 0;
width: 100%;
z-index: 10;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<header>
<div>
<h1 style="padding-bottom: 50px; background-color: blue;">
Hello World!
</h1>
</div>
<nav>
A nav bar here!
</nav>
</header>
<main style="height: 1000px;">
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</main>

Answer 6

Like mentioned, sticky works that way. However there is a CSS hack that you can play around with.
Disclaimer
This is an ugly hack and will probably create a lot of problems with the following content. So I would not recommend it for most usecases. Having that said...
Negative margin hack
There is a hack you could play around with including negative margin. If you extend the height of the container and then give it some negative bottom margin, it could at least "visually leave" the container.
I altered your code and created a JSFiddle for demonstration.
HTML
<div class="page">
<div class="parent">
<div class="child"><p>...<br>...<br>...<br>...<br>...</p></div>
<div class="child-sticky">
<p>i want to be sticky, even when I'm outside my parent.</p>
</div>
<div class="child"><p>...<br>...<br>...<br>...<br>...</p></div>
<div class="child"><p>...<br>...<br>...<br>...<br>...</p></div>
</div>
<div class="following-content">
</div>
</div>
CSS
.child-sticky {
height: 200px;
background: #333366;
position:sticky;
top:20px;
color:#ffffff;
}
.parent {
height: 1250px;
background: #555599;
margin-bottom: -500px;
}
.following-content {
background: red;
height:500px;
}
.child {
background-color: #8888bb;
}
.page {
height: 3000px;
background: #999999;
width: 500px;
margin: 0 auto;
}
div {
padding: 20px;
}
https://jsfiddle.net/74pkgd9h/