What is em? Is it the size of text showed up on screen.. Like 2em meaning 2 times the present size of text..??

Answer 1

Em is for important text. The <em> tag is a phrase tag. It renders as emphasized text. And in browsers this tagged text shown as italic.
And you can't use 2em as any tag. It is for any important text of any paragraph.

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Answer 2

u can use em in CSS as px for sizeing texts,but thats how is used!

Answer 3

Em is like pixels on css so its up to you whether to use