How to Constrain Child Elements Within Curved Divs in CSS?

Enforcing Boundaries: Constraining Child Elements Within Curved Divs

In CSS, a common layout challenge arises when a child div extends beyond the curved borders of its containing div. This can lead to an aesthetically unappealing overlap. To address this issue, we delve into the question: "How to force child elements to obey their parent's curved borders?"

According to CSS specifications, the background elements are clipped to the curve defined by their parent. However, this rule does not apply to child elements. Hence, the content of these child elements can extend past the curve.

To resolve this problem, an effective solution is to utilize the "overflow: hidden" property on the parent div. However, it is important to note that this solution may not work in older versions of Firefox.

As a workaround, users can define curves for individual borders of the child element, as exemplified by the following code:

<code class="css">#inner {
    border-top-right-radius: 10px;
    border-top-left-radius: 10px;
}</code>

However, this workaround is limited to addressing individual borders. A comprehensive solution capable of clipping all child elements to the curve is yet to be achieved.

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