For checking a regular expression in input fields of HTML forms which attribute

For checking a regular expression in input fields of HTML forms which attribute is used?

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1) In HTML Audio/Video DOM, __________ sets or returns the CORS settings of the audio/video.

2) Which of the following attribute is used to display date/time content?

3) The interactive element audio with the attribute controls must not appear as a descendant of which element?

4) Which element(s) represents a section of a document that links to other documents?

5) __________ allows the iframe to pull in content from elsewhere in the same domain.