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Is this HTML valid? Or is the id 'a' the same as the id 'A'?
<div id="a">alpha</div> <div id="A">Alpha</div> 
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Note: The id name is case sensitive! Note: The id name must contain at least one character, cannot start with a number, and must not contain whitespaces (spaces, tabs, etc.).
JavaScript is a case-sensitive language. This means that the language keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters.
The DOM id Property is used to set or return the id of an element i.e value of the Id Attribute. An ID should be different in a document. It is returned by using the document.
Yes. It is case-sensitive. Attribute values are always case-sensitive. Different browsers seem to be doing different things though.
Handling document.getElementById is different across browsers:
Mozilla performs case-sensitive search.
Internet Explorer: IE 8 and later performs case-sensitive search, while IE 7 and earlier performs case-insensitive search.
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