46 lines
1.2 KiB
Markdown
46 lines
1.2 KiB
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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padding-top: 50%;
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}
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```
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#### Demo
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Resize your browser window to see the proportion of the element remain the same.
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<div class="snippet-demo">
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<div class="snippet-demo__constant-width-to-height-ratio"></div>
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</div>
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<style>
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.snippet-demo__constant-width-to-height-ratio {
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background: #333;
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width: 50%;
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padding-top: 50%;
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}
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</style>
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#### Explanation
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`padding-top` and `padding-bottom` can be used as an alternative to `height` such that the percentage value
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causes an element's height to become a percentage of its parent's width, i.e. `50%` means the height will be 50% of the parent element's width, which means it acts the same as `width`. This allows its proportion to remain constant.
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#### Browser support
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<span class="snippet__support-note">⚠️ `padding-top` pushes any content within the element to the bottom.</span>
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