Re: [csswg-drafts] Parameters typed on CSS rules ? (#5824)

If I unterstand your proposal correctly, then the [`attr()` function](https://drafts.csswg.org/css-values-4/#attr-notation) might already cover your use case.

It keeps the selectors untouched but references the values defined in element attributes.

Here are some examples:
```css
.selector {
  opacity: attr(data-opacity number); /* numeric value */
  font-size: attr(data-font-size length); /* length value */
  background-color: attr(data-bgcolor color, white); /* color value with white as fallback */
  background-image: url(attr(data-bgimage url)); /* url value */
}
```

Though note that this function is still under discussion due to [security concerns](https://github.com/w3c/csswg-drafts/issues/5092) among other things.

Happy New Year! 🥳 🍾 

Sebastian

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