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Write JavaScript that shows a tooltip over an element with the attribute data-tooltip. The value of this attribute should become the tooltip text.

That’s like the task Comportement info-bulle, but here the annotated elements can be nested. The most deeply nested tooltip is shown.

Only one tooltip may show up at the same time.

For instance:

<div data-tooltip="Here – is the house interior" id="house">
  <div data-tooltip="Here – is the roof" id="roof"></div>
  <a href="" data-tooltip="Read on…">Hover over me</a>

The result in iframe:

Open a sandbox for the task.