What is Tag? Why Tag use? How to use Tag?

What is <!DOCTYPE> Tag?This is not a html tag, this is just a declaration tag. The <!DOCTYPE> declaration refers Document Type Declaration (DTD). Why <!DOCTYPE> Tag use?This is not nesessor to use <!DOCTYPE> tag, but this is declar the html virson. So, you must be use this <!DOCTYPE> Tag. If not, perhaps the program will …

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