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* Improve usage share * Remove 'No caveats' note from all snippets * Fix transform-centering usage: #search -> #feat * transform -> transforms2d * Add missing link for multiline truncate
45 lines
1.0 KiB
Markdown
45 lines
1.0 KiB
Markdown
### Custom variables
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CSS variables that contain specific values to be reused throughout a document.
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#### HTML
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```html
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<p class="custom-variables">CSS is awesome!</p>
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```
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#### CSS
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```css
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:root {
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/* Place variables within here to use the variables globally. */
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}
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.custom-variables {
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--some-color: #da7800;
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--some-keyword: italic;
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--some-size: 1.25em;
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--some-complex-value: 1px 1px 2px whitesmoke, 0 0 1em slategray, 0 0 0.2em slategray;
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color: var(--some-color);
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font-size: var(--some-size);
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font-style: var(--some-keyword);
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text-shadow: var(--some-complex-value);
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}
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```
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#### Demo
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#### Explanation
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The variables are defined globally within the `:root` CSS pseudo-class which matches the root element of a tree representing the document. Variables can also be scoped to a selector if defined within the block.
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Declare a variable with `--variable-name:`.
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Reuse variables throughout the document using the `var(--variable-name)` function.
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#### Browser support
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- https://caniuse.com/#feat=css-variables
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<!-- tags: other -->
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