What happens if you don't write doctype at the beginning of html - Education and Training Encyclopedia

What happens if you don't write doctype at the beginning of html

Its main function is to declare the version of html.

& lt！ DOCTYPE html & gt This is html5.

Failure to write may make the functions of html5 unusable.

Whether it will go wrong depends on the fault tolerance of the browser.

It is recommended to keep a standardized habit.

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