HTML (Hypertext Markup Language) provides various elements and tags for formatting content on the web. Here are some common HTML formatting elements:

1.  Headings (<h1> to <h6>): Used to define headings. <h1> is the largest and <h6> is the smallest.

<h1>This is a Heading 1</h1>
<h2>This is a Heading 2</h2>
<!-- ... -->
<h6>This is a Heading 6</h6>

2. Paragraph (<p>): Represents a paragraph of text.

<p>This is a paragraph of text.</p>

3. Bold (<strong> or <b>): Indicates strong importance or emphasis. By default, browsers render this text as bold.

<p>This is <strong>strong</strong> or <b>bold</b> text.</p>

4.  Italic (<em> or <i>): Represents emphasized text. By default, browsers render this text as italic.

<p>This is <em>emphasized</em> or <i>italic</i> text.</p>

5. Underline (<u>): Represents underlined text. While <u> is a formatting tag, it's often recommended to use CSS for underlining.

<p>This is <u>underlined</u> text.</p>

6. Strikethrough (<s>, <strike>, or <del>): Represents text that has been struck through.

<p>This is <s>struck through</s> or <del>deleted</del> text.</p>

7. Superscript (<sup>): Represents superscript text (text appearing above the baseline).

<p>This is <sup>superscript</sup> text.</p>

8.  Subscript (<sub>): Represents subscript text (text appearing below the baseline).

<p>This is <sub>subscript</sub> text.</p>

9. Line Break (<br>): Inserts a line break within text.

<p>This text is on the first line.<br>This text is on the second line.</p>

10.  Horizontal Rule (<hr>): Represents a thematic break or horizontal line.

<p>This is some text above the line.</p>
<hr>
<p>This is some text below the line.</p>

These elements help structure and format content on a web page.