document element
Computing term referring to a structural component of a document, such as a paragraph, heading, or list item, especially in markup languages like XML or HTML.
In XML, document elements define the structure of the data.
This document element contains a title and body text.
要素 is a general term for 'element' or 'factor', while 文書要素 specifically refers to a document element in computing contexts.
Compound of 文書 (document) and 要素 (element), likely a calque from English 'document element' used in computing.