Bootstrap badges
Bootstrap badges are small count and labeling components.
Example
Badges scale to suit the size of the parent element by using relative font sizing and em units.
<h1>Heading 1 <span class="badge badge-secondary">Badge</span></h1>
<h2>Heading 2 <span class="badge badge-secondary">Badge</span></h2>
<h3>Heading 3 <span class="badge badge-secondary">Badge</span></h3>
<h4>Heading 4 <span class="badge badge-secondary">Badge</span></h4>
<h5>Heading 5 <span class="badge badge-secondary">Badge</span></h5>
<h6>Heading 6 <span class="badge badge-secondary">Badge</span></h6>Badges can be used as part of links or buttons to provide a counter.
<button type="button" class="btn btn-primary">
Notifications <span class="badge badge-light">4</span>
</button>Remark that depending on how you use them, badges may be complicated for users of screen readers and related assistive technologies.
Unless the context is clear, consider including additional context with a visually hidden piece of additional text.
<button type="button" class="btn btn-primary">
Profile <span class="badge badge-light">9</span>
<span class="sr-only">unread messages</span>
</button>Contextual variations
Add any of the below-mentioned classes to modify the presentation of a badge.
<span class="badge badge-primary">Primary</span>
<span class="badge badge-secondary">Secondary</span>
<span class="badge badge-success">Success</span>
<span class="badge badge-danger">Danger</span>
<span class="badge badge-warning">Warning</span>
<span class="badge badge-info">Info</span>
<span class="badge badge-light">Light</span>
<span class="badge badge-dark">Dark</span>Conveying meaning to assistive technologies
Using color to add meaning only provides a visual indication, which will not be conveyed to users of assistive technologies – such as screen readers. Ensure that information denoted by the color is either obvious from the content itself (e.g. the visible text), or is included through alternative means, such as additional text hidden with the .sr-only class.
Pill badges
Apply the .badge-pill modifier class to make badges rounded.
<span class="badge badge-pill badge-primary">Primary</span>
<span class="badge badge-pill badge-secondary">Secondary</span>
<span class="badge badge-pill badge-success">Success</span>
<span class="badge badge-pill badge-danger">Danger</span>
<span class="badge badge-pill badge-warning">Warning</span>
<span class="badge badge-pill badge-info">Info</span>
<span class="badge badge-pill badge-light">Light</span>
<span class="badge badge-pill badge-dark">Dark</span>Links
Using the contextual .badge-* classes on an <a> element quickly provide actionable badges with hover and focus states.
<a href="#" class="badge badge-primary">Primary</a>
<a href="#" class="badge badge-secondary">Secondary</a>
<a href="#" class="badge badge-success">Success</a>
<a href="#" class="badge badge-danger">Danger</a>
<a href="#" class="badge badge-warning">Warning</a>
<a href="#" class="badge badge-info">Info</a>
<a href="#" class="badge badge-light">Light</a>
<a href="#" class="badge badge-dark">Dark</a>