Rocket Validator automatically checks your pages on the W3C Validator.
HTML issues tagged as space not allowed.
<iframe> element allows to embed an HTML document inside another HTML document, and its
src attribute is indicated the source URL of the embedded web page. The query part of that URL contains one or more space characters, which are not allowed, for example:
<iframe src="https://maps.google.it/maps?q=2700 6th Avenue"></iframe>
You should properly escape all space characters as
%20 like this:
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