[csswg-drafts] Pull Request: [css-masking-1] Re-allow specifying `fill` before other `mask-border-slice` component values

cdoublev has just submitted a new pull request for https://github.com/w3c/csswg-drafts:

== [css-masking-1] Re-allow specifying `fill` before other `mask-border-slice` component values ==
Moved from https://github.com/w3c/fxtf-drafts/pull/530.

This PR re-allows specifying `fill` before the other component values of [`mask-border-slice`](https://drafts.csswg.org/css-masking-1/#propdef-mask-border-slice), like in [`border-image-slice`](https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-slice).

This is not allowed since this [commit](https://github.com/w3c/fxtf-drafts/commit/7af5acb2b6d290a3fa9508cf76af05b772057b23#diff-aacf1a334bd4ec16c705bf164f6bc873cbaee4b25944da51f00184c321b84562L1167-L1171), but I think it was unintentional.

Basically, this commit moved the property definition table of `mask-box-image-slice` from `masking/Masking.src.html`:

  > ```html
  > <tr>
  >   <th>Name:
  >   <td><dfn>mask-box-image-slice</dfn>
  > <tr>
  >   <th><a href="#values">Value</a>:
  >   <td>[<var>&lt;number&gt;</var> | <var>&lt;percentage&gt;</var>]{1,4} &amp;&amp; fill?
  > ```

... to `masking/Overview.src.html`:

  > **Name:** `mask-box-image-slice`
  > **Value:** `[<<number>> | <<percentage>>]{1,4} fill?`

An later `mask-box-image-slice` was renamed to `mask-border-slice`.

See https://github.com/w3c/csswg-drafts/pull/13681


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Received on Thursday, 19 March 2026 12:38:19 UTC