I'm trying to create a snackbar / toast version with Bootstrap 4. I start with this tutorial from w3schools.
Updated: I was trying to implement a custom snackbar or toast for Bootstrap 4 but, right now, it isn't necessary beacause Bootstrap 4 includes this option from version 4.2 as @Zim says.
Bootstrap 4.2 now includes Toast notifications
Here's an example:
<div class="toast" role="alert" aria-live="assertive" aria-atomic="true">
<div class="toast-header">
<strong class="mr-auto">Title</strong>
<small>5 mins ago</small>
<button type="button" class="ml-2 mb-1 close" data-dismiss="toast" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="toast-body">
Content... this is a toast message.
</div>
</div>
More Bootstrap Toast layout/position examples:
Stacked vertically: https://codeply.com/go/3ZvZa9b8Im
Side-by-side: https://codeply.com/go/GFMde2ritI
3x3 grid: https://codeply.com/go/lj8GTFjvuK