Netscape and Opera both ignore improperly terminated URLs used as the BASE HREF value. eg: relative URLs in a document that used "" as the HREF would resolve to "http://[relative URL]", and "" would resolve to "[relative URL]". To prevent this problem, use a trailing "/" character to properly terminate the URL. Internet Explorer, by the way, accepts both URL forms.

BASE element refers to "", hyperlink refers to "index.html"
(Should successfully link to the Indexdot main page):

filler text Link to "index.html" filler text