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I believe the original spec
older operating systems could only handle three-letter extensions
hostname is case insensitive. folders and files are case sensitive on Linux systems.
[edited by: Sgt_Kickaxe at 12:09 am (utc) on Nov 24, 2012]
From a pure SEO standpoint "pagename" would be best
it's all the information you need to share though none of the examples would likely be considered bad by any major search engine.They were purely examples of innocent words when joined together can spell something different.
given that the default style for anchor text is underlined, underscores in URLs are a poor usabillity practice.
i.e., is that an underscore or an underlined space character?
People either click it, bookmark it or select and copy it, neither action requires knowing if it's an underscore or a space.
Nowadays, you don't need any extension at all on the end of the URL for a page.
I agree, you don't need anything. I use ... .htm for webpages.
I certainly wouldn't do any other extension like .php or something that divulges the underlying site technology
[edited by: Dan01 at 4:23 am (utc) on Nov 24, 2012]