Does ID have to be unique in the whole page?

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Does an ID have to be unique in the whole page?

No.

Because the HTML Living Standard of March 15, 2022, clearly states:

The class, id, and slot attributes may be specified on all HTML elements. …….
When specified on HTML elements, the id attribute value must be unique amongst all the IDs in the element’s tree and must contain at least one character. The value must not contain any ASCII whitespace.

and a page may have several DOM trees. It does, for example, when you’ve attached (Element.attachShadow()) a shadow DOM tree to an element.

A document tree and its underlying shadow trees

TL; DR

Does an ID have to be unique in the whole page?

No.

Does an ID have to be unique in a DOM tree?

Yes.

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