html in iframe source code example
Example 1: iframe
<!DOCTYPE html>
<html>
<body>
<iframe src="https://comercioiturama.blogspot.com/" width="800" height="600"></iframe>
</body>
</html>
Example 2: iframe attributes
<iframe width="560" height="315" src="https://www.youtube.com/embed/owsfdh4gxyc" frameborder="0" allowfullscreen></iframe>