This PR allows you to add custom utilities to your project via the new
`@utility` rule.
For example, given the following:
```css
@utility text-trim {
text-box-trim: both;
text-box-edge: cap alphabetic;
}
```
A new `text-trim` utility is available and can be used directly or with
variants:
```html
<div class="text-trim">...</div>
<div class="hover:text-trim">...</div>
<div class="lg:dark:text-trim">...</div>
```
If a utility is defined more than one time the latest definition will be
used:
```css
@utility text-trim {
text-box-trim: both;
text-box-edge: cap alphabetic;
}
@utility text-trim {
text-box-trim: both;
text-box-edge: cap ideographic;
}
```
Then using `text-trim` will produce the following CSS:
```css
.text-trim {
text-box-trim: both;
text-box-edge: cap ideographic;
}
```
You may also override specific existing utilities with this — for
example to add a `text-rendering` property to the `text-sm` utility:
```css
@utility text-sm {
font-size: var(--font-size-sm, 0.875rem);
line-height: var(--font-size-sm--line-height, 1.25rem);
text-rendering: optimizeLegibility;
}
```
Though it's preferred, should you not need to add properties, to
override the theme instead.
Lastly, utilities with special characters do not need to be escaped like
you would for a class name in a selector:
```css
@utility push-1/2 {
right: 50%;
}
```
We do however explicitly error on certain patterns that we want to
reserve for future use, for example `push-*` and `push-[15px]`.
---------
Co-authored-by: Adam Wathan <4323180+adamwathan@users.noreply.github.com>
Co-authored-by: Adam Wathan <adam.wathan@gmail.com>
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