Ah, my bad. Yes, if scripts are available, this is available. It doesn't
allow you to do anything new, aside from forcing a decode to start (which
you could do by adding the image to the DOM tree, assuming it is visible)
and knowing when the decode has completed. The usual content restrictions
will continue to apply.

On Wed, Nov 7, 2018 at 11:23 AM, Boris Zbarsky <bzbar...@mit.edu> wrote:

> On 11/7/18 11:15 AM, Andrew Osmond wrote:
>
>> This is simply a
>> new method for JS on image elements, so it should be unavailable.
>>
>
> Script can run in sandboxed iframes, depending on sandboxing flags.
>
> It sounds like this feature is enabled by default in sandboxed iframes, as
> long as script is enabled, right?
>
> -Boris
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