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AFAIK, there isn't one.
The homepage is www.runescape.com.
I visited Amazon's homepage.
My homepage was plain with a white background.
just go to the site for making it you homepage ,sometimes there is written "make it you homepage click it. Or right-click it and select homepage.
For example go to Bing there will be written homepage click it
An HTML homepage is usually named index.html and will link your visitors to the homepage of your website.