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<u>: The Unarticulated Annotation (Underline) element - HTML: HyperText Markup Language | MDN
The HTML element represents a span of inline text which should be rendered in a way that indicates that it has a non-textual annotation. This is rendered by default as a simple solid underline, but may be altered using CSS.
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External link:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/u