confused

Question

<simply writing this> works as a omment

Answer 1

It don't works as a comment: it just be ignored by browser, as comment but will fail validation and could produce unpredictive behaviour ( random issues according to browser used ), while comment ( <!-- this is a valid comment --> ) are ignored ( always, with any browser ) and code is still valid Html ^^

Answer 2

Looking at your question i feel even more confused.

What is <simply writing this>?
What is omment?
What do you want to ask actually?

Answer 3

@calvin just write like this <this is a comment> and check it