http://whatwg.org/specs/web-apps/current-work/#processing says:
# HTTP 300 Multiple Choices responses should be handled automatically if # possible (treating the responses as if they were 302 Moved Permanently # responses pointing to the appropriate resource), and otherwise must be # treated as HTTP 404 responses. "302 Moved Permanently" should probably either say "301 Moved Permanently" or "302 Found". -David -- L. David Baron <URL: http://dbaron.org/ > Technical Lead, Layout & CSS, The Mozilla Foundation
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