39b676c125
* Improve usage share * Remove 'No caveats' note from all snippets * Fix transform-centering usage: #search -> #feat * transform -> transforms2d * Add missing link for multiline truncate
44 lines
925 B
Markdown
44 lines
925 B
Markdown
### Constant width to height ratio
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Given an element of variable width, it will ensure its height remains proportionate in a responsive fashion
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(i.e., its width to height ratio remains constant).
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#### HTML
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```html
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<div class="constant-width-to-height-ratio"></div>
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```
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#### CSS
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```css
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.constant-width-to-height-ratio {
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background: #333;
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width: 50%;
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}
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.constant-width-to-height-ratio::before {
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content: '';
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padding-top: 100%;
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float: left;
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}
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.constant-width-to-height-ratio::after {
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content: '';
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display: block;
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clear: both;
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}
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```
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#### Demo
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#### Explanation
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`padding-top` on the `::before` pseudo-element causes the height of the element to equal a percentage of
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its width. `100%` therefore means the element's height will always be `100%` of the width, creating a responsive
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square.
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This method also allows content to be placed inside the element normally.
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#### Browser support
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<!-- tags: layout -->
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