WebAIM: Links and Hypertext - Hypertext Links - 0 views
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Users should generally be alerted to links that lead to non-HTML resources, such as PDF files, Word files, PowerPoint files, and so on.
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nearly everyone agrees that users ought to be alerted when the link does not open in the current window or frame.
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As with file types above, these icons (with appropriate alternative text) must appear within the link rather than just after it.