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Popovers are used to bring attention to specific user interface elements, typically to suggest an action or to guide users through a new experience.

A popover consist of:

  • The block element, .Popover, which simply positions its content absolutely atop other body content.
  • The child element, .Popover-message, which contains the markup for the intended messaging and the visual "caret."

In the examples below, Popover-message, in particular, uses a handful of utility classes to style it appropriately. And these are intended to demonstrate the default, go-to presentation for the popover's message. By default, the message's caret is centered on the top edge of the message.

The Popover-message element also supports several modifiers. By default, the caret is shown on the top edge of the message, horizontally centered. To change the caret's position, use one of the following modifiers.

Each of these modifiers also support a syntax for adjusting the positioning the caret to the right, left, top, or bottom of its respective edge. That syntax looks like:

Lastly, there is an added .Popover-message--large modifier, which assumes a slightly wider popover message on screens wider than 544px.


The samples below include optional markup, like:

  • An outermost container that establishes stacking context (e.g. position-relative).
  • A choice piece of user interface (a button, in this case) to relate the popover to.
  • Use of the Details and js-details family of class names, which interact with JavaScript to demonstrate dismissal of the popover by clicking the nested "Got it!" button.

Basic example

Defaults to caret oriented top-center.

Large example