HTML content example from SharePoint modern page Text Webpart. See image example https://ibb.co/ffB0Ge.

SharePoint-Modern-Page-ClientSideText.html

<p>Normal text<strong> Bold text</strong><em> italic text</em><u> Underline text </u><span class="fontSizeSmall">Font size 12 </span><a data-interception="off" href="https://www.google.com">Link</a></p>

<p><span class="fontColorThemePrimary">Color theme primary</span><span class="fontColorRed"> Color pick red</span>&nbsp; <span class="highlightColorYellow">Highlight color yellow</span></p>

<p style="text-align:center;">Centered text</p>

<p style="text-align:right;">Left text</p>

<p style="text-align:justify;">Justified text</p>

<p style="margin-left:40px;">Indent text</p>

<h2>Heading 1</h2>

<h3>Heading 2</h3>

<h4>Heading 3</h4>

<ul>
	<li>bullet list</li>
</ul>

<ol>
	<li>number list</li>
</ol>

<blockquote>
<p>Quote</p>
</blockquote>

<p>&nbsp;</p>

<div class="canvasRteResponsiveTable">
<div class="tableWrapper">
<table class="bandedRowTableStyleTheme" title="Table">
	<tbody>
		<tr>
			<td>A</td>
			<td><strong>B</strong></td>
			<td><strong>C</strong></td>
		</tr>
		<tr>
			<td>1</td>
			<td>10</td>
			<td>OK</td>
		</tr>
		<tr>
			<td>
			<p>2</p>
			</td>
			<td>20</td>
			<td>OK</td>
		</tr>
		<tr>
			<td>3</td>
			<td>30</td>
			<td>OK</td>
		</tr>
	</tbody>
</table>
</div>
</div>