Do you have a lot of errors on your Webmaster Tools Structured Data? It seems that it does not affect search results but you may want to remove all these errors for the sake of contentment. Below are some errors you could encounter on your...
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Embed HTML
Many sites and online services, like Google Maps, suggest HTML code (usually iframes) to embed widgets and content on your page.
You can add such HTML widgets in your quizzes.
Please note:
In case pasted code is not just iframe tag it will be wrapped into HTTPS iframe.
Only HTTPS sources for iframes, styles and javascript links are supported.
Non-HTTPS sources will be blocked by the browser and won't behave properly.