Crypto Knowledge Base is a curated page designed to provide an introduction to cryptocurrency & blockchain. Start with the video from Don Tapscott. This page is for educational purposes only, not to be considered financial advice.
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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.
In case pasted code is not just iframe tag it will be wrapped into HTTPS iframe.
Non-HTTPS sources will be blocked by the browser and won't behave properly.