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currently if the upper scope of the nested rule is compound selector like below:
```css
.foo, .bar {
& .baz {
padding: 0;
}
}
```
It will use `:is()` in the result:
```css
:is(…
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There are a bunch of specifications which might be added to the Rough Interoperability section.
## [CSS Nesting 1](https://www.w3.org/TR/css-nesting-1/)
Current status: WD (last published: 14 Fe…
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## Problem
In v7.1.1, Jest-styled-components replaced `css` dependency to `@adobe/css-tools`. There is a bug in `@adobe/css-tools` where its parses chained selectors incorrectly. Chained selectors …
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### Provide a general summary of the issue here
Tailwind's [arbitrary group selectors](https://tailwindcss.com/docs/hover-focus-and-other-states#arbitrary-groups) are incorrect after adding the tai…
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CSS Level 4 Selectors
#### Available on site now:
- [`:placeholder-shown`](http://caniuse.com/#feat=css-placeholder-shown)
- [`:in-range` & `:out-of-range`](http://caniuse.com/#feat=css-in-out-of-r…
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If I attempt to validate a class selector that starts with a number I returned with a message of `Parse error: Percent sign is expected`
My code looks like:
```
const selector = '.123';
try …
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https://github.com/adobe/spectrum-css/blob/3c7de5e07d34ca6ca1ae873ff32f4e7a02d1f0ad/components/popover/index.css#L319-L346
This will generate selectors like `.spectrum-Popover--withTip.spectrum-Pop…
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css_parser.mly parses stylesheets/selectors/declarations/properties and values
Parser.re currently parses (and type-checks) properties + values (there's code in Parser.re that might make it possibl…
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Currently, we allow only element ID references.
Several options mentioned at the F2F:
[Web Annotations Selectors](https://www.w3.org/TR/annotation-model/#selectors)
[CSS Selectors 3](https://w…
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This came up in the PR I created for #1403. The proposed changes were the following:
```diff
if (!empty($element['#type'])) {
- $attributes['class'][] = 'form-type-' . strtr($element['#type'], '…