UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.101 Safari/537.36

Example URL:

Steps to reproduce the problem:
1. embed a youtube video in a document that has CSS styling for iframes set to float left.
2. render the page.  The video will load and then disappear
3. Styling iframe with display: block has no change.
4. If you check/uncheck display: block or float: left in the browser, the video will appear again.
5. If you wrap the video in another element that is float left, the iframe will display correctly.

What is the expected behavior?
Iframe should display on pageload without then disappearing

What went wrong?
Videos disappear after briefly rendering on page load.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? Yes Chrome 59

Does this work in other browsers? Yes

Chrome version: 60.0.3112.101  Channel: stable
OS Version: OS X 10.12.6
Flash Version: 

We ran into this while building out www.keithmitnik.com/videos.  On that page our solution was to wrap the embed in a floated div.

Someone else ran into this issue and posted about it on Stack Overflow here:
https://stackoverflow.com/questions/45895023/iframe-with-float-disappearing-in-chrome