What if one does not use the doctype in the starting of

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What if one does not use the doctype in the starting of HTML document?

1. Browser stops working
2. Browser crashes after showing the page
3. Browser finds the document in quirky mode
4. Browser finds a document in standard mode
5. None of these

Correct Option: C

If the browser finds in the starting of an HTML document it sets the document in standard mode but if one does not use a doctype, the browser goes to quirky mode. In this mode, certain content will not be displayed as per one wrote that. So it is always recommended to write a doctype at the very start of the HTML document.