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I am not sure whether is it correct to have <h2> tag inside <summary> tag.
Whether semantically it is valid to have <h2> or <h1> tag inside <summary> tag?
753
The semantics would depend on the specific content you had and the context it appears in.
From a validity point of view, the spec says:
Content model:
Phrasing content, optionally intermixed with heading content.
So, it is valid.
63
Sure, it is allowed. But you have to style a bit with CSS to avoid wrapping. To test the aviabillity use the W3-Validator and use the W3Schools as well.
<!DOCTYPE html>
<html>
<head>
<title>HTML Summary usage</title>
</head>
<body>
<details>
<summary><h1>Copyright 1999-2014.</h1></summary>
<p> - by Refsnes Data. All Rights Reserved.</p>
<p>All content and graphics on this web site are the property of the company Refsnes Data.</p>
</details>
<p><b>Note:</b> The summary element is not supported in Edge/Internet Explorer.</p>
</body>
</html>
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