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What is HTMLUnknownElement?

in HTML & JavaScript on February 13, 2021

It is exactly what it sounds. An unknown element.

HTMLUnknownElement is an interface that means an invalid HTML element.

As per W3 cubs docs, it derives from the HTMLElement interface, but without implementing any additional properties or methods.

HTMLUnknownElement

Image Source: w3cubs

In JavaScript, document.createElement() method creates an HTMLUnknownElement if tagName isn’t recognized.

Syntax of Document.createElement()


let element = document.createElement(tagName[, more options]);

As you can see in the syntax of createElement() above, if it can’t recognize the tagName then it will create HTMLUnknownElement.

Source: MDN

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