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

a) <brief>
b) <summary>
c) <mark>
d) <main>

Answer: b
Explanation: The main content of document is in <main>. <mark> is used to highlight the text to indicate it’s uniqueness. The summary tag defines a visible heading for the details element. The heading can be clicked to view/hide the details.

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