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) Which tag is used for defining an alternate content for users that do not support client-side scripts?

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

3) External style sheets are referred in web document through a

4) HTML tags are?

5) Which tag provides data about page expiry, page author, list of keywords, page description etc.