Allowed values are the same as the global lang attribute. Hints at the human language of the linked URL.
While web browsers may not support other URL schemes, websites can with registerProtocolHandler(). Pieces of media files with media fragments. 
Specific text portions with text fragments.Sections of a page with document fragments.Links are not restricted to HTTP-based URLs - they can use any URL scheme supported by browsers: Old Firefox versions (before 82) prioritize the header and will display the content inline. If the header specifies a disposition of inline, Chrome and Firefox prioritize the attribute and treat it as a download.
If the header specifies a filename, it takes priority over a filename specified in the download attribute. If the Content-Disposition header has different information from the download attribute, resulting behavior may differ:. The user may be prompted before a download starts, or the file may be saved automatically, or it may open automatically, either in an external application or in the browser itself. How browsers treat downloads varies by browser, user settings, and other factors. 
download only works for same-origin URLs, or the blob: and data: schemes. Allowing cross-origin use of images and canvas. HTML table advanced features and accessibility. From object to iframe - other embedding technologies. Assessment: Structuring a page of content.
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