Youtube iFrame, preview image not appearing in chrome - google-chrome

I have this youtube embed video:
<iframe width="100%" height="700" src="https://www.youtube.com/embed/9NAG-3hwvS0" frameborder="0" allowfullscreen></iframe>
but in google chrome, the preview image does not appear. Why? It works in firefox and ie, but not chrome
Here is a screenshot of what I see:

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example here: https://jsfiddle.net/jorgemorgado25/m1xugp3y/2/
<iframe
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width="100%" height="400"
scrolling="yes"
frameborder=0>

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<div id="map">
<iframe src="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3318.696943944399!2d151.1583871672438!3d-33.71678997379185!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x6b12a81ea4faa843%3A0x50a13de5485336ce!2sToolang+Oval!5e0!3m2!1sen!2sus!4v1544995023725"
width="100%" height="300" frameborder="0" style="border:0" allowfullscreen></iframe>
</div>
Live Link

Safari opens iframe in new tab

I am trying to open a link in an iFrame. The following code works in both Chrome and Firefox, but not in Safari. Safari opens the link in a new tab.
I have also tried setting an id on the iframe (id = name), but that did not help.
<iframe name="videoframe" src="" width="640" height="360" frameborder="0"
webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
{{ $skill->title }}
The $skill->url holds a valid url, and the $skill->title holds a title.
I need some help as to how to get safari to open this link in the iframe, and not in a new tab.

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<iframe width="550" height="400" src="http://techslides.com/demos/sample-videos/small.mp4" frameborder="0"></iframe>

Youtube insterted video not showing full screen button when accessed through iframe in Chrome

I'm unsure as to why I'm unable to see the full screen button when viewing an embedded youtube video through an iframe in chrome. This only occurs in chrome (tested with Firefox, IE, Safari, Chrome).
You can see what I mean with the below fiddle as it renders through an iframe.
<iframe width="560" height="315" src="//www.youtube.com/embed/BKorP55Aqvg" frameborder="0" allowfullscreen></iframe>
http://jsfiddle.net/9sgng/
Is this a bug/google preference or is there a way around it?
I worked out that I only had allowfullscreen on the youtube iframe, but you also need it on the iframe that is holding the youtube iframe.