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Why use all lowercase when making URL pages

I am creating a website for a small business and was wondering if I have to use lowercase for HTML. If so, why?
1 Solution
David S.Commented:
You don't have to, but it's best practice to, because consistency is good and it's one of the things that you can do to make a future conversion to XHTML much easier.
A little confusing with your question.  In your question you ask about URL.  In your second question you ask about HTML.

You do not need to use upper or lower case.  It is your choice.  But consistency is certainly good.  XHTML is standard to use lowercase but using upper case will not effect your page.  Actually, it can help you distinguish between code elements.

In a URL, just know that URL's ARE case sensitive; at least everything except for the domain name.  So if someone wants to just go to one of your pages off memory that is...  www.mypage.com/ClothingandShoes.html and they just type www.mypage.com/clothingandshoes.html, they will get an error.

So, to make things easy, it is simply suggested to use lowercase, not required.
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