CSS block-overflow Property

CSS block-overflow Property

The block-overflow property in CSS controls how content overflows when it exceeds the block container's dimensions.

1. Syntax

selector {
  block-overflow: [clip | ellipsis | visible];
}

Accepted Values:

Value	Description
clip	Cuts off overflowing content without adding an ellipsis (...).
ellipsis	Displays an ellipsis (...) when content overflows.
visible	Allows overflowing content to be fully displayed.

2. Example – Using block-overflow: ellipsis;

.box {
  width: 200px;
  height: 50px;
  block-overflow: ellipsis;
  overflow: hidden;
  display: block;
  white-space: nowrap;
}

<div class="box">
  This is a long text that will be truncated with an ellipsis when it overflows.
</div>

✅ If the text is too long, it will end with "...".

3. Example – Using block-overflow: clip;

.box {
  width: 200px;
  height: 50px;
  block-overflow: clip;
  overflow: hidden;
  display: block;
}

✅ This cuts off overflowing content without adding an ellipsis.

4. Example – Using block-overflow: visible;

.box {
  width: 200px;
  height: 50px;
  block-overflow: visible;
  display: block;
}

✅ Overflowing text will still be visible beyond the element's boundaries.

5. Best Practices

✔ Use ellipsis for text truncation.
✔ Combine with overflow: hidden; for better clipping control.
✔ Use visible carefully to prevent unwanted overflow.