What Makes an Element a Scrolling Box in CSS Positioned Layout?

Understanding Scrolling Boxes in CSS Positioned Layout

Question:

What defines a "scrolling box" in the context of CSS Positioned Layout?

Answer:

According to the CSS Positioned Layout Module Level 3 (Working Draft), a scrolling box is determined by the overflow property. If an element has its overflow set to a value other than visible, it becomes a scrolling box.

Implementation:

To switch on or off the scrolling behavior of a box, modify its overflow property. Setting it to visible removes scrolling, while other values, such as auto, hidden, or scroll, enable it.

For example, in the following code:

<div class="wrapper">
  <div><p>If .wrapper has its overflow set to hidden, the inner div will become a scrolling box. Conversely, if .wrapper's overflow is set to visible, the inner div will no longer scroll.</p></div>
</div>

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