30-seconds-of-code/constant-width-to-height-ratio.md at 11eff23e47b0cf8b0af706090127ebf3685ace3f

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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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Constant width to height ratio

Given an element of variable width, it will ensure its height remains proportionate in a responsive fashion (i.e., its width to height ratio remains constant).

HTML

<div class="constant-width-to-height-ratio"></div>

CSS

.constant-width-to-height-ratio {
  background: #333;
  width: 50%;
}
.constant-width-to-height-ratio::before {
  content: '';
  padding-top: 100%;
  float: left;
}
.constant-width-to-height-ratio::after {
  content: '';
  display: block;
  clear: both;
}

Demo

Explanation

padding-top on the ::before pseudo-element causes the height of the element to equal a percentage of its width. 100% therefore means the element's height will always be 100% of the width, creating a responsive square.

This method also allows content to be placed inside the element normally.

Browser support

✅ No caveats.

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