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It does not really matter the indentation of the labels, it does not affect the content of the web page. The problem happens when your web page has a lot of code, if you do not make the identation it takes longer to edit and correct the syntax errors. That is why it is recommended to identity your code as it helps to optimize the code edition
Indentation is generally used to make a code neater and make it more readable. So even if you don't put indentation and spaces it doesn't really matter in HTML. Indentation helps developers to understand code more easily.
thank you everyone :)