Embed
The Embed tag embeds HTML for a provided URL using oEmbed. oEmbed is an open format designed to allow embedding content from a website into another page.
Example:
<Embed>https://vimeo.com/105089367</Embed>
For a list of supported oEmbed providers, see Embeds | WordPress.org.
Responsive
By default, the Embed tag includes a small script to make embedded content responsive. This supports content of any proportions.
Optionally, use the ratio attribute to provide a fixed ratio of width to height, separated by : a colon.
<Embed ratio="1:1">..</Embed>
<Embed ratio="4:3">..</Embed>
This will use a CSS solution to make content responsive, which is more efficient than using JavaScript.