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Home/ Questions/Q 9010717
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Editorial Team
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Editorial Team
Asked: June 16, 20262026-06-16T02:32:16+00:00 2026-06-16T02:32:16+00:00

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

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

I tried to prototyping it like this: HTMLUnknownElement.prototype.style.backgroundColor = "red"; but it doesn’t work.

Could you please help me, how to manage it?

Thanks in advance,

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  1. Editorial Team
    Editorial Team
    2026-06-16T02:32:17+00:00Added an answer on June 16, 2026 at 2:32 am

    There isn’t really a reason to do that.

    When you want to create an element with red background, you should use an existing element and assign a CSS class to it which has red background (like <span class="test">) .

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