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Which of the following defines a visible heading for <details> element?

(a) <summary>

(b) <section>

(c) <mark>

(d) <main>

This question was addressed to me by my college professor while I was bunking the class.

My question comes from HTML5 Semantics in portion Advance HTML of HTML

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The correct answer is (a) <summary>

Easiest explanation: The <summary> tag is new in HTML5. <summary> element defines a visible heading for <details> element. This heading can be clicked to hide/view the details. This element is not supported by Internet Explorer. Sections in document is defined by <section> element. <mark> element is used to highlight the context/paragraph/text. Main content of document is specified by <menu> element.

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