[whatwg] AllowSeamless

Adam Barth w3c at adambarth.com
Sun May 27 03:19:11 PDT 2012

On Sun, May 27, 2012 at 3:00 AM, Markus Ernst <derernst at gmx.ch> wrote:
> Am 27.05.2012 02:16 schrieb Adam Barth:
>> I've added a proposal to the wiki
>> <http://wiki.whatwg.org/wiki/AllowSeamless>  about letting a document
>> indicate that it is willing to be displayed seamlessly with a
>> cross-origin parent.  This proposal is a refinement of the approach
>> previously discussed in this thread:
>> <http://old.nabble.com/crossorigin-property-on-iframe-td33677754.html>.
>> Let me know if you have any feedback.
> I have a strong feeling that per-origin control should be made easy for
> authors. I must admit that I am not familiar with the mechanisms you name,
> Frame-Options and ancestor-origins - and both are quite hard to google for.
> From what I found I assume both are about HTTP headers.
> If they are solutions that can be used easily with server-side languages
> such as PHP, I think we can live with it. But anyway it is a complication;
> I'd personnally prefer something like
> allowseemles="example.org, *.example.org, shop.otherdomain.com"
> Or maybe space separated, and separate inherit-style with comma:
> allowseemles="example.org *.example.org shop.otherdomain.com, inherit-style"
> (Regardless of whether it is in the HTML element or in a META element.)

I had difficulty coming up with use cases that weren't better served
with frame-ancestors and/or Frame-Options.  Do you have a specific use
case in mind to explain your feelings?


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