[css-houdini-drafts] [css-properties-values-api] Type-aware substitution from andruud via GitHub on 2018-08-13 (public-houdini-archive@w3.org from August 2018)

From: andruud via GitHub <sysbot+gh@w3.org>
Date: Mon, 13 Aug 2018 13:37:23 +0000
To: public-houdini-archive@w3.org
Message-ID: <issues.opened-350033150-1534167442-sysbot+gh@w3.org>

andruud has just created a new issue for https://github.com/w3c/css-houdini-drafts:

== [css-properties-values-api] Type-aware substitution ==
In issue, #321, it is indicated that the following is not valid, for a &lt;color>-registered property `--color`:

```
--color: green;
animation-name: var(--color);
```

Because `animation-name` does not take a &lt;color>, it's invalid, and presumably behaves like `unset`. This means that substitution does not happen via tokens, but via some "transplant" from one property to another. Or it happens via tokens, but with an added layer of property-specific type-checking. Or something. The spec needs to clarify.

The spec should probably also mention how type awareness plays a role (if any) for partial substitutions, e.g:

```
width: calc(10% + var(--reg-length));
background-image: url(a), var(--reg-image-list), url(b)
```

Please view or discuss this issue at https://github.com/w3c/css-houdini-drafts/issues/793 using your GitHub account

Received on Monday, 13 August 2018 13:37:26 UTC