Reining in Children's Content Within Parents' Curved Edges in CSS

Question:

How to prevent a child div, "#inner," from extending beyond the curved borders of its parent div, "#outer," despite attempts to restrain it?

Explanation:

According to CSS specifications, borders and background effects clip to the curve, while replaced elements always trim their content to the curve. However, content can still overlap.

Solution:

Overflow: hidden on #outer: In browsers other than Firefox 3.6 and below, this should confine #inner's content to the parent's curve.
Specific Border Curves on #inner: Alternatively, define specific curves for each border in Firefox 3.6 and lower.
```
#inner {
  -moz-border-radius: 10px 10px 0 0;
}
```
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Overflow: hidden Specific Curves on #inner: For optimal compatibility, combine both approaches for a clean solution.
```
#outer {
  overflow: hidden;
}

#inner {
  -moz-border-radius: 10px 10px 0 0;
}
```
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Example:

<div id="outer" style="background-color: white; overflow: hidden; border-radius: 10px;">
  <div id="inner" style="background-color: green; -moz-border-radius: 10px 10px 0 0;">
  </div>
</div>

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Result:

inner now respects the curved boundaries of #outer, ensuring a visually harmonious design.

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