[whatwg] idea for .zhtml format #html5 #web

Thomas Broyer t.broyer at gmail.com
Fri Apr 2 12:41:32 PDT 2010

On Fri, Apr 2, 2010 at 8:39 PM, Eduard Pascual <herenvardo at gmail.com> wrote:
> On Fri, Apr 2, 2010 at 6:25 PM, Doug Schepers <doug at schepers.cc> wrote:
> > I don't think it's defined anywhere, but a browser could choose to save
> > bundled resources as a self-contained Widget ("File > Save as Widget..."),
> > which would be a great authoring solution for Widgets.
> Isn't that the same thing, in essence, as MS did with IE? IIRC, IE had
> an choice, on its save dialog, to "Save full page", which packed the
> html page + all the CSS, JS, image, and other dependencies within a
> ".mht" (called meta-HTML) file (which, of course, only IE would be
> able to open afterwards).

MHTML stands for MIME-encapsulated HTML and is an IETF RFC:

> The fact is that this feature has been removed from the more recent
> versions of IE (not sure if it was from IE6 or 7). It would be
> interesting to know why MS decided why such a feature should be
> removed.

Selecting Page -> Save as... on IE8 brings the save file dialog with
the type defaulting to "Web Archive, single file (*.mht)"

> At first glance, the only potential issue I see (both with IE's old
> MHT format and with any possible zhtml) is XSS: when a downloaded file
> is loaded from the local filesystem into the browser, which is its
> domain?

The one from its Content-Location MIME header.

Thomas Broyer

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