The type property of the HTMLSourceElement interface is a string representing the MIME type of the media resource.
It reflects the type attribute of the <source> element.
A string.
<video>
<source
id="el"
src="large.webp"
type="video/webp"
media="screen and (width >= 600px)" />
</video>const el = document.getElementById("el");
console.log(el.type); // Output: "video/webp"