How to make child elements respect parent’s curved border in CSS?

"Curved border forces child elements to respect parent element border" in CSS

Problem:

In HTML, child elements are placed inside the parent element, and the parent element has a curved border. However, the child element will extend beyond the parent element's curved border. How to make child elements respect the parent element's curved border?

CSS code sample:

<code class="css">#outer {
  display: block;
  float: right;
  margin: 0;
  width: 200px;
  background-color: white;
  overflow: hidden;
  border-radius: 10px;
}

#inner {
  background-color: #209400;
  height: 10px;
  border-top: none;
}</code>

Answer:

According to CSS3 specification:

The content of the replaced element is always trimmed to the content edge curve.

This means setting overflow:hidden on the parent element #outer should work. However, this does not work in Firefox 3.6 and below. The issue has been fixed in Firefox 4:

Rounded corners now clip content and images (if overflow:visible is not set).

So the solution should be:

<code class="css">#outer {
  overflow: hidden;
}

#inner {
  -moz-border-radius: 10px 10px 0 0;
}</code>

This solution is for Firefox 3.6 and below.

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