MDN’s new design is in Beta! A sneak peek:

Type: nsITreeContentView
For trees built with a content builder - that is, those that do not have flags set -- the contentView will be a reference to the nsITreeContentView for the tree. This interface lets you retrieve the DOM element corresponding to a given a row index and vice versa. For trees that are not built with a content builder, the functions of nsITreeContentView will not be available, since there are no DOM nodes to retrieve. In newer versions of Mozilla, the contentView property is actually a synonym for the view property, since the two interfaces are flattened together into a single interface in JavaScript. This property is read-only.

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