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11eff23e47b0cf8b0af706090127ebf3685ace3f
30-seconds-of-code/snippets/popout-menu.md
atomiks 11eff23e47 Autoscoping (#103) 
* Add autoscoping with generated demo

* Remove manual demo from all snippets

* Add JavaScript inside IIFE

* Align mouse-cursor-gradient-tracking.md to demo code

* Match snippets to demo

* Update CONTRIBUTING.md

* Create reusable function for code extraction
2018-10-05 09:18:51 +10:00

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Popout menu

Reveals an interactive popout menu on hover and focus.

HTML

<div class="reference" tabindex="0">
  <div class="popout-menu">
    Popout menu
  </div>
</div>

CSS

.reference {
  position: relative;
  background: tomato;
  width: 100px;
  height: 100px;
}
.popout-menu {
  position: absolute;
  visibility: hidden;
  left: 100%;
  background: #333;
  color: white;
  padding: 15px;
}
.reference:hover > .popout-menu,
.reference:focus > .popout-menu {
  visibility: visible;
}

Demo

Explanation

  1. position: relative on the reference parent establishes a Cartesian positioning context for its child.
  2. position: absolute takes the popout menu out of the flow of the document and positions it in relation to the parent.
  3. left: 100% moves the the popout menu 100% of its parent's width from the left.
  4. visibility: hidden hides the popout menu initially and allows for transitions (unlike display: none).
  5. .reference:hover > .popout-menu means that when .reference is hovered over, select immediate children with a class of .popout-menu and change their visibility to visible, which shows the popout.

Browser support

✅ No caveats.