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) Which type attribute of input element sets the element’s value to a string representing a number?

2) In HTML Audio/Video DOM, __________ returns a MediaError object representing the error state of the audio/video.

3) Which of the following tag is used for audio in HTML5 ?

4) Which of the following allows the sandboxed iframe to run scripts from the same domain?

5) Which of the following element marks the ruby text component of a ruby annotation?