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Which element is a placeholder inside web component?

(a) <shadow>

(b) <content>

(c) <slot>

(d) <element>

I got this question in an international level competition.

My doubt is from HTML5 Semantics topic in portion Advance HTML of HTML

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The correct choice is (c) <slot>

Easiest explanation: <shadow> is obsolete part of web component used to shadow DOM. The obsolete part of web components is <content>. <slot> element in HTML is a part of Web Components technology suite. It is a placeholder inside web component that you can fill with own markup that lets you create separate DOM trees and present them together. <element> is one of part of web components, used to custom DOM elements.

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