Doctype declaration

The instructions say that the doctype declaration is case sensitive but when I run the code in lower case and alternative case it works fine. So is it okay if I declare in lower case? If not, what kind of problems may arise?

Hi @abdullah7 !
I saw the doctype declaration challenge and what they said is
The ! and uppercase DOCTYPE is important, especially for older browsers.
You see, older browsers .It may cause problem in new latest browsers but it’s safer to type DOCTYPE .Other tags are not case sensitive.

I understand. Thanks for your reply

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