[whatwg] a rel=attachment

Andy Mabbett andy at pigsonthewing.org.uk
Thu Jul 14 12:15:03 PDT 2011

2011/7/14 Ian Fette (イアンフェッティ) <ifette at google.com>:
> Many websites wish to offer a file for download, even though it could
> potentially be viewed inline (take images, PDFs, or word documents as an
> example). Traditionally the only way to achieve this is to set a
> content-disposition header. *However, sometimes it is not possible for the
> page author to have control over the response headers sent by the
> server.*(A related example is offline apps, which may wish to provide
> the user with
> a way to "download" a file stored locally using the filesystem API but again
> can't set any headers.) It would be nice to provide the page author with a
> client side mechanism to trigger a download.
> After mulling this over with some application developers who are trying to
> use this functionality, it seems like adding a "rel" attribute to the <a>
> tag would be a straightforward, minimally invasive way to address this use
> case. <a rel=attachment href=blah.pdf> would indicate that the browser
> should treat this link as if the response came with a content-disposition:
> attachment header, and offer to download/save the file for the user.

How would this be different to the already-available rel="enclosure" ?

Andy Mabbett

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