[whatwg] @srcdoc and default @sandbox

Maciej Stachowiak mjs at apple.com
Mon Aug 30 10:18:25 PDT 2010

On Aug 30, 2010, at 10:02 AM, Tab Atkins Jr. wrote:

> While talking with the implementor of @srcdoc in Webkit, it came up
> that, though @srcdoc is *designed* for use with @sandbox, the author
> still has to explicitly add @sandbox to the <iframe> or else they
> don't get the sandbox security model.
> Can we make this automatic?  Specifically, when <iframe
> srcdoc=foo></iframe> is specified (without @sandbox), it drops into
> the sandbox security model as if <iframe sandbox srcdoc=foo></iframe>
> was used.  If @sandbox is explicitly added, its value is instead used,
> so the author can set the sandbox security flags if desired.
> This would mean that there is no way for an author to use @srcdoc
> *without* sandboxing.  This appears to be a minority use-case in the
> first place (as far as I can tell, it's pretty much just useful for
> testing purposes), but the author can always use a data: url in that
> case.

I think it's better to let these remain orthogonal features. In general I think it is a net negative to usability when Feature A implicitly turns on Feature B. Implicit relationships like this make the Web platform more confusing.


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