css/docs/content/components/popover.md

title	path	status	source	bundle
Popover	components/popover	Experimental	https://github.com/primer/css/tree/master/src/popover	popover

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.

• .Popover-message--bottom Places the caret on the bottom edge of the message, horizontally centered.
• .Popover-message--right: Places the caret on the right edge of the message, vertically centered.
• .Popover-message--left: Places the caret on the left edge of the message, vertically centered.

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:

• .Popover-message--bottom-left
• .Popover-message--bottom-right
• .Popover-message--left-bottom
• .Popover-message--left-top
• .Popover-message--right-bottom
• .Popover-message--right-top
• .Popover-message--top-left
• .Popover-message--top-right

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

Notes

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.

<div class="position-relative text-center">
  <button class="btn btn-primary">UI</button>
  <div class="Popover right-0 left-0 position-relative">
    <div class="Popover-message text-left p-4 mt-2 mx-auto Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
</div>

Large example

<div class="position-relative text-center">
  <button class="btn btn-primary">UI</button>
  <div class="Popover right-0 left-0 position-relative">
    <div class="Popover-message Popover-message--large text-left p-4 mt-2 Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
</div>

Bottom

<div class="position-relative text-center">
  <div class="Popover position-relative">
    <div class="Popover-message Popover-message--bottom p-4 mx-auto mb-2 text-left Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
  <button class="btn btn-primary">UI</button>
</div>

Bottom-right

<div class="position-relative text-right pr-2">
  <div class="Popover position-relative">
    <div class="Popover-message Popover-message--bottom-right p-4 mb-2 text-left Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
  <button class="btn btn-primary">UI</button>
</div>

Bottom-left

<div class="Popover position-relative pl-2">
  <div class="Popover-message Popover-message--bottom-left p-4 mb-2 Box box-shadow-large">
    <h4 class="mb-2">Popover heading</h4>
    <p>Message about this particular piece of UI.</p>
    <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
  </div>
  <button class="btn btn-primary">UI</button>
</div>

Left

<div class="d-flex flex-justify-center flex-items-center">
  <button class="btn btn-primary">UI</button>
  <div class="Popover position-relative">
    <div class="Popover-message Popover-message--left p-4 ml-2 Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
</div>

Left-bottom

<div class="d-flex flex-justify-center flex-items-end">
  <button class="btn btn-primary">UI</button>
  <div class="Popover position-relative">
    <div class="Popover-message Popover-message--left-bottom p-4 ml-2 Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
</div>

Left-top

<div class="d-flex flex-justify-center flex-items-start">
  <button class="btn btn-primary">UI</button>
  <div class="Popover position-relative">
    <div class="Popover-message Popover-message--left-top p-4 ml-2 Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
</div>

Right

<div class="d-flex flex-justify-center flex-items-center">
  <div class="Popover position-relative">
    <div class="Popover-message Popover-message--right p-4 mr-2 Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
  <button class="btn btn-primary">UI</button>
</div>

Right-bottom

<div class="d-flex flex-justify-center flex-items-end">
  <div class="Popover position-relative">
    <div class="Popover-message Popover-message--right-bottom p-4 mr-2 Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
  <button class="btn btn-primary">UI</button>
</div>

Right-top

<div class="d-flex flex-justify-center flex-items-start">
  <div class="Popover position-relative">
    <div class="Popover-message Popover-message--right-top p-4 mr-2 Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
  <button class="btn btn-primary">UI</button>
</div>

Top-left

<div class="position-relative pl-2">
  <button class="btn btn-primary">UI</button>
  <div class="Popover position-relative">
    <div class="Popover-message Popover-message--top-left p-4 mt-2 Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
</div>

Top-right

<div class="position-relative text-right pr-2">
  <button class="btn btn-primary">UI</button>
  <div class="Popover right-0 position-relative">
    <div class="Popover-message Popover-message--top-right text-left p-4 mt-2 Box box-shadow-large">
      <h4 class="mb-2">Popover heading</h4>
      <p>Message about this particular piece of UI.</p>
      <button type="submit" class="btn btn-outline mt-2 text-bold">Got it!</button>
    </div>
  </div>
</div>