I have a question, why do I need to use iframe, is it necessary?

[houxinlin]

I have a question, why do I need to use iframe? Is it necessary?

[FedericoBonel]

Hey @houxinlin!

You don’t need to use it, you can opt out of it.

The main reason to use the iframe is for the viewports functionality, which lets you preview the page at different screen sizes.