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How to create a new html element?

I tried to create a new HTML element called a test: <test>some text</test>

I tried to prototype it as follows: HTMLUnknownElement.prototype.style.backgroundColor = "red"; but it does not work.

Could you help me how to handle this?

Thanks in advance,

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2 answers

There really is no reason for this.

If you want to create an element with a red background, you must use the existing element and assign it a CSS class that has a red background (for example, <span class="test"> ).

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How about createElement() ?

 var el = document.createElement("test"); el.style.backgroundColor = "red"; document.body.appendChild(el);

change

If we start with:

 <html> <head></head> <body> </body> </html>

The result will be:

 <html> <head></head> <body> <test style="background-color:red"></test> </body> </html>
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