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) __________ can be used to advise the browser to download media content in the background to improve playback.

2) Which element represents marked or highlighted text for reference purposes?

3) In HTML Audio/Video DOM, __________ sets or returns whether the audio/video should start over again when finished.

4) .midi extension file format is aan

5) Which of the following defines a group of related options in a drop-down list.