For uniquely identifying an elements name which attribute is used?

For uniquely identifying an elements name which attribute is used?

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1) <SCRIPT> … </SCRIPT> tag can be placed within ________

2) Tags that are used to tell meaning of enclosed text (e.g. <strong> </strong> ) these type of tags are called

3) Some tags enclose the text. Those tags are known as

4) For smallest size headings which tag you most prefer to use

5) A small piece of program that can add interactivity to your website is called as