Fix opacity modifier using CSS variables #14916
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When using an opacity modifier such as `bg-black/[var(--opacity)]`, then
this was translated to:
```css
.bg-black\/\[var\(--opacity\)\] {
background-color: color-mix( in oklch, var(--color-black, #000) calc(var(--opacity) * 100%), transparent);
}
```
The issue is that this part: `calc(var(--opacity) * 100%)` is invalid
_if_ the `var(--opacity)` already contains a percentage value. See: https://play.tailwindcss.com/xz0tv5rbFF
This is because this eventually resolves to `calc(20% * 100%)` and `20%
* 100%` is invalid in CSS.
In Catalyst we use variables like that _with_ the `%` included, which
means that v4 doesn't work as expected when using this.
A variable with a `%` included is probably the better value to support
compared to the the unit less one. This also allows you to define your
variables using `@property` as a proper `<percentage>` type.
Unfortunately the `var(--opacity)` is a value that can change at
runtime, so we don't know the type at compile time.
In the future we might be able to use `first-valid(…)` (see: https://drafts.csswg.org/css-values-5/#first-valid)
and generate both versions at the same time.
adamwathan
reviewed
Nov 8, 2024
adamwathan
approved these changes
Nov 8, 2024
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When using an opacity modifier such as
bg-black/[var(--opacity)], then this was translated to:The issue is that this part:
calc(var(--opacity) * 100%)is invalid if thevar(--opacity)already contains a percentage value. See: https://play.tailwindcss.com/xz0tThis is because this eventually resolves to
calc(20% * 100%)and20% 100%is invalid in CSS.In Catalyst we use variables like that with the
%included, which means that v4 doesn't work as expected when using this.A variable with a
%included is probably the better value to support compared to the the unit less one. This also allows you to define your variables using@propertyas a proper<percentage>type.Unfortunately the
var(--opacity)is a value that can change at runtime, so we don't know the type at compile time.In the future we might be able to use
first-valid(…)(see: https://drafts.csswg.org/css-values-5/#f and generate both versions at the same time.