Re: [csswg-drafts] [css-box-4] Applying `margin-trim` to fragmentation containers (#10761)

What about column spanners and their margins?

https://drafts.csswg.org/css-box-4/#margin-trim

> For [in-flow](https://drafts.csswg.org/css-display-4/#in-flow) boxes contained by this box, margins adjacent to the box’s specified edges are truncated to zero.

Is a spanner an in-flow box contained by a multicol container?

```html
<!DOCTYPE html>
<div style="columns:3; margin-trim:block;">
  <div>
    <div style="column-span:all; margin-top:11px; margin-bottom:22px;"></div>
  </div>
</div>
```

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Received on Friday, 25 July 2025 10:59:27 UTC