!doctype error

#1


why is the problem?


Replace this line with your code. 
<!doctype> do not operate...
https://www.codecademy.com/courses/web-beginner-en-LceTK/0/2?curriculum_id=50579fb998b470000202dc8b#
please help me...

#2

Correct doctype declaration for HTML5 is:

<!DOCTYPE html>
#3

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