Is it necessary to have selector's name in same case in css and html? -

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Is it the name of the selector in the same case in CSS and HTML?

Is that okay? 

  & lt; Div id = "HEADER" & gt; & Lt; / Div & gt; #header {...}

Or is it necessary? 

  & lt; Div id = "HEADER" & gt; & Lt; / Div & gt; #HEADER {...}

Category name and id are case sensitive, so they

Therefore, div.MyClass no as div.myClass .

Elements (in HTML) and pseudo-category (everywhere) names are not sensitive, therefore DIV: hover is as div : Hover .

For more information, read.


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