What does this.parentNode.parentNode (parent node of parent node) mean?

What does this.parentNode.parentNode (parent node of parent node) mean?
The parent node of the parent node, for example, there is such a paragraph
HTML:

Copy code
The code is as follows:

<form id="form">
<div id="divA">
<div id="divB"> <input type="button" value="Delete" onClick="deleteMe(this.parentNode.parentNode);">
</div>
</div>
</form>

In this case, this.parentNode is divB, and this.parentNode.parentNode is divA. The so-called parentNode is the node on the previous layer.

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