Re: [csswg-drafts] [css-display] Unclear definition of "formatting context" (#5105)

> a given formatting context doesn't see the outside world

Yes, and that's why we can't have all boxes establish an independent formatting context.

```html
<div style="float: left">float</div>
<div id="parent" style="border: 3px solid blue">
  <div id="child" style="border: 3px solid green">text</div>
</div>
```

Note that the float shrinks the line boxes of `#child`. But `#child` is not a sibling of the float, it's inside `#parent`. So if `#parent` established an independent formatting context, `#child` could not be affected by the float.

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