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HTML 4.01 Specification ã® Resolving relative URIs
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User agents must calculate the base URI for resolving relative URIs according to [RFC1808], section 3. The following describes how [RFC1808] applies specifically to HTML.
User agents must calculate the base URI according to the following precedences (highest priority to lowest):
- The base URI is set by the BASE element.
- The base URI is given by meta data discovered during a protocol interaction, such as an HTTP header (see [RFC2616]).
- By default, the base URI is that of the current document. Not all HTML documents have a base URI (e.g., a valid HTML document may appear in an email and may not be designated by a URI). Such HTML documents are considered erroneous if they contain relative URIs and rely on a default base URI.
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