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, most of which position the caret differently:

• .Popover-message--top (default): Places the caret on the top edge of the message, horizontally centered.
• .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>