bogdan

Embeds are needed to embed video from youtube or to embed Google Map or just to embed content from external page. 
WordPress removes embed when you switch from “HTML” to “Visual” tab because of the security reasons. 
So you can embed object code using this shortcode <code>[iframe src="http://player.vimeo.com/video/3261363" width="100%" height="480"]</code>.

iframe to embed

Embeds are needed to embed video from youtube or to embed Google Map or just to embed content from external page.

unapersona

Easily insert iframes inside the block editor.
This plugin adds an Iframe block inside the Embeds category.
Insert an external (or internal) URL by simple drag and dropping the Simple Iframe block.

Simple Iframe

No more edit the html of the iframe, put easily in block editor with height and width.
Great Job Jorge!!!

Great as simple

Works flawlessly, it does what it says it does and what it has to do. It's a perfect solution to show external contents with an iframe solution.

This is "a must" block.

Perfect solution for iframe content

Lo necesitaba, así evito añadir una colección de bloques para usar solo uno.

Sencillo y útil.

It is not necessary to create plugins with many functions, thanks Jorge for the contribution!

Simple and great

Easily insert iframes inside the block editor.

iframe to embed vs Simple Iframe