[css-display] "root element" is undefined

[cvrebert]

https://drafts.csswg.org/css-display/#transformations

The root element’s display type is always blockified.

https://drafts.csswg.org/css-display/#initial-containing-block

initial containing block
The containing block of the root element.

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The term "root element" is neither hyperlinked nor explicitly defined. My skimming of the DOM spec is that, while it defines tree, root, and element, the root of a normal DOM tree would instead be the Document node. Nor does DOM appear to define how its definition of "root" would/could be modified by the adjective "element".

Searching further, it appears to me that document element would be the correct term to use in these cases.

[Loirooriol]

The root of the DOM tree is the document node. The root of the element tree used by CSS is the document element if the element tree is produced from a DOM, but the specs try not to assume that. See #4888 for assuming a DOM (or something isomorphic to a DOM).

[fantasai]

Fixed, thanks for the report!