Bootstrap alerts are feedback messages which are displayed after specific actions preceded by the user. Length of the text is not limited.

Simple Alert

<div class="alert alert-primary" role="alert">
   This is a primary alert—check it out!
<div class="alert alert-secondary" role="alert">
   This is a secondary alert—check it out!
<div class="alert alert-success" role="alert">
   This is a success alert—check it out!
<div class="alert alert-danger" role="alert">
   This is a danger alert—check it out!
<div class="alert alert-warning" role="alert">
   This is a warning alert—check it out!
<div class="alert alert-info" role="alert">
   This is a info alert—check it out!
<div class="alert alert-light" role="alert">
   This is a light alert—check it out!
<div class="alert alert-dark" role="alert">
   This is a dark alert—check it out!

Additional content

Alerts can also contain additional HTML elements like headings, paragraphs and dividers.

<div class="alert alert-success" role="alert">
  <h4 class="alert-heading">Well done!</h4>
  <p>Aww yeah, you successfully read this important alert message. This example text is going to run a bit longer so that you can see how spacing within an alert works with this kind of content.</p>
  <p class="mb-0">Whenever you need to, be sure to use margin utilities to keep things nice and tidy.</p>


Using the alert JavaScript plugin, it’s possible to dismiss any alert inline. Here’s how:

<div class="alert alert-warning alert-dismissible fade show" role="alert">
  <strong>Holy guacamole!</strong> You should check in on some of those fields below.
  <button type="button" class="close" data-dismiss="alert" aria-label="Close">
    <span aria-hidden="true">&times;</span>