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Which element is used for defining a new custom DOM elements?

(a) <element>

(b) <shadow>

(c) <slot>

(d) <content>

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I would like to ask this question from HTML5 Semantics topic in section Advance HTML of HTML

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Right answer is (a) <element>

To elaborate: <element> is HTML obsolete element. It was the part of Web Components specification. It was intended to be used to define new custom DOM elements. It was removed in favor of JavaScript-driven approach for creating new custom elements. <shadow> is obsolete part of web component used to shadow DOM. <slot> element in HTML is a part of Web Components technology suite. The obsolete part of web components is <content>.

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