문단, em, strong, b, i

<p>This is a paragraph of text. Browsers add margin above and below paragraphs automatically.</p>
<p>This is a second paragraph. It starts on a new line.</p>

<p>I <em>never</em> said she stole the money.</p>
<p>I never said <em>she</em> stole the money.</p>
<!-- Same words, different meaning depending on which is emphasized -->
<!-- Screen readers change inflection on em content -->

<p><strong>Warning:</strong> Do not enter this area without protective equipment.</p>
<p>The deadline is <strong>Friday at 5 PM</strong>.</p>
<!-- strong = this content is more important than surrounding text -->
<!-- Screen readers may emphasize strong content differently -->

<p>The ship was called <i>HMS Beagle</i>.</p>
<p>The CSS property is <i>display</i>.</p>
<p><em>Please</em> be careful.</p>

<p>The product is called <b>ProSuite</b>.</p>
<p><b>Note:</b> All fields are required.</p>
<p>This step is <strong>critical</strong> — do not skip it.</p>

<p>This is <strong>very <em>important</em></strong>.</p>
<!-- strong (important) wraps em (stressed) -->
<!-- Result: bold italic text with both semantic meanings -->

<!-- INVALID: nested paragraphs -->
<p>First paragraph <p>nested paragraph</p></p>

<!-- The browser auto-closes the first p before the second opens -->
<!-- Always use separate paragraph tags -->
<p>First paragraph.</p>
<p>Second paragraph.</p>

<!-- Valid: inline content in p -->
<p>Text with <strong>bold</strong> and <a href="/">a link</a>.</p>

<!-- INVALID: block element inside p -->
<p>
  <div>A div inside p is invalid</div>
</p>

<!-- Bad: using br for paragraph spacing -->
First paragraph<br><br>Second paragraph

<!-- Good: use p elements -->
<p>First paragraph</p>
<p>Second paragraph</p>

<!-- Bad: bold for visual style only -->
<b>Heading Text</b>

<!-- Good: use h elements for headings -->
<h2>Heading Text</h2>