https://www.ampproject.org/contact/ not getting validation error for using <iframe> instead of <amp-iframe>

[bcko]

so I read the ampproject.org guide about iframe.
it says we should use amp-iframe.
I was wondering why https://www.ampproject.org/contact/ doesn't get validation error?
when I look at the source code of https://www.ampproject.org/contact/ , I see that it did not use to embed google forms.

I tried using just <iframe> to embed google map for the website I am making and I get a validation error.
However, I also do not get a validation error for embed <iframe> google forms.

is it because it is a google form?
thank you for your help!

[cramforce]

Just checked. Works for me. That says nothing about us should fixing that iframe.

[bcko]

https://www.ampproject.org/contact/ uses <iframe> instead of and doesn't get a validation error. I was wondering when are cases we can use <iframe>?

below is the source code from the site

<iframe src="https://docs.google.com/forms/d/19a_8yKgbrhZSoqHRUpTOQazN229-TIVHZqI4UvSpj_c/viewform?embedded=true" width="100%" height="100%" frameborder="0" marginheight="0" marginwidth="0">Loading...</iframe>
</div>

[cramforce]

I'm getting a validation error. Could you post a screenshot?
On Jan 29, 2016 8:06 AM, "Byungcheon Ko" [email protected] wrote:

https://www.ampproject.org/contact/ uses instead of and
doesn&#39 #39 get a
validation error. I was wondering when are cases we can use <iframe>?

below is the source code from the site

<iframe
src="
https://docs.google.com/forms/d/19a_8yKgbrhZSoqHRUpTOQazN229-TIVHZqI4UvSpj_c/viewform?embedded=true"
width="100%" height="100%" frameborder="0"
marginheight="0"
marginwidth="0">Loading...</iframe> </div>

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