Is it necessary to wrap <strong>, <em>, <b>, <i> inside <p> tag, if content is not paragraph?

For example:

This is ok

<div>
    <p>some <strong>long</strong> text</p>
    <strong>- end -</strong>
    <p>some long text</p>
</div>

Or this is more semantically correct?

<div>
    <p>some <strong>long</strong> text</p>
  开发者_StackOverflow中文版  <p><strong>- end -</strong></p>
    <p>some long text</p>
</div>

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If it isn't a paragraph, then it shouldn't be marked up as a paragraph. (The HTML specification explains how to read the DTD to determine what elements are allowed at a given point in a document.)

<p><strong>- end -</strong></p>

… however, I don't know what this is. You should follow the normal rules for grammar.

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Academic answer: both are XHTML-compatible. Practical answer: browsers won't give a sh@t about it

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If the content is not a paragraph, then it is not semantic to mark it as such.

If your end marker is designed to be read, then it is debatable whether or not it is actually a paragraph or not. If it's not designed to be read, then it shouldn't be marked up with reading-oriented tags like <strong>, but instead should be in a span or div with a stylesheet applied to make the font weight bold.

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The spec doesn't say you have to. The validator is happy for you to have it in some other block-level container.

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Seems to me that "- end -" is a case for an <hr/> or a p:after{content:"-end-"}

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As you mentioned the lower is more semantically correct as the <strong> tag is not a block level element which means you need to wrap it in the <p>. Otherwise I'm sure you will come across issues when you try and validate your HTML.