Trouble embedding a simple iframe into my site – brings back an error when published.
Could you please update your post with some more information so we can help you faster? Things like your read-only link & screenshots really helps us to help you faster 
How to share a read-only link:
Thanks in advance! 
This is the read only link:
https://preview.webflow.com/preview/migostudy?preview=9dcbadad7c5a79c3d954eb4cc1170a0e
Thank you v much
It appears to be the quotes used in the custom embed, chrome is treating the embed like this:
<iframe id="“ucas_adviser_widget”" src="“https://www.ucasdigital.com/widgets/advisers/ucas-adviser-widget.html”" width="“300”" height="“250”" frameborder="“0”" scrolling="“no”"></iframe>
where the “ then becomes the first character of the url, which results in chrome treating the url as a relative path since it doesn’t begin with a protocol chrome knows how to handle (ex: http)
Updating all the “ to " in the custom code should fix things.
Let me know if that doesn’t work!
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