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8eca436b3c
This PR reduces the specificity of the * variant so that classes
directly on the child elements take precedence over the styles applied
by the parent.
Previously a utility like `*:flex` would generate this CSS:
```css
.\*\:flex > * {
display: flex;
}
```
This selector has a specificity of `0,1,0`, which is the same as the
specificity for a bare utility class like `flex`, `block`, or `grid`.
Because variants always appear later in the CSS file than bare
utilities, this means that given this HTML, the `grid` class on the
child element would have no effect:
```html
<div class="*:flex">
<div>...</div>
<div class="grid">...</div>
<div>...</div>
</div>
```
After this PR, the `*:flex` utility generates this CSS instead:
```css
:where(.\*\:flex > *) {
display: flex;
}
```
This selector has a specificity of `0,0,0`, so even though it appears
later in the CSS, a bare utility with a specificity of `0,1,0` will
still take precedence.
This is something we wanted to do when we first introduced the `*`
variant in the v3 series, but couldn't because having such a low
specificity meant that styles in Preflight would take precedence over
utilities like `*:flex`, which is not would anyone would want.
We can make this change for v4 because now all of Preflight is wrapped
in a dedicated `@layer`, and rules from later layers always take
precedence over rules from earlier layers even if the rule in the later
layer has a lower specificity.
---------
Co-authored-by: Adam Wathan <4323180+adamwathan@users.noreply.github.com>