HTML Kitchen Sink (taken from BlueTrip CSS Framework) includes the major (and minor) HTML tags you might use on any given site.
<h1>Level 1 heading</h1>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h1 class="fancy">Level 1 heading class="fancy"</h1>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h1 class="thin">Level 1 heading class="thin"</h1>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h1 class="caps">Level 1 heading class="caps"</h1>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h2>Level 02 Heading</h2>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h2 class="fancy">Level 2 heading class="fancy"</h2>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h2 class="thin">Level 2 heading class="thin"</h2>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h2 class="caps">Level 2 heading class="caps"</h2>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h3>Level 03 Heading</h3>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h3 class="fancy">Level 3 heading class="fancy"</h3>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h3 class="thin">Level 3 heading class="thin"</h3>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h3 class="caps">Level 3 heading class="caps"</h3>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h4>Level 04 Heading</h4>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h4 class="fancy">Level 4 heading class="fancy"</h4>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h4 class="thin">Level 4 heading class="thin"</h4>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h4 class="caps">Level 4 heading class="caps"</h4>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h5>Level 05 Heading</h5>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h5 class="fancy">Level 5 heading class="fancy"</h5>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h5 class="thin">Level 5 heading class="thin"</h5>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h5 class="caps">Level 5 heading class="caps"</h5>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h6>Level 06 Heading</h6>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h6 class="fancy">Level 6 heading class="fancy"</h6>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h6 class="thin">Level 6 heading class="thin"</h6>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<h6 class="caps">Level 6 heading class="caps"</h6>
<p>Sed scelerisque sagittis lorem. Phasellus sodales. Nulla urna justo, vehicula in, suscipit nec, molestie sed, tellus.</p>
<blockquote>
<p>Paragraph inside Blockquote: Nam libero leo, elementum in, dapibus a, suscipit vitae, purus. Duis arcu. Integer dignissim fermentum enim. Morbi convallis felis vel nibh. Sed scelerisque sagittis lorem.</p>
</blockquote>
<address>
Address: Example address 224, Sweden
</address>
<pre>
<strong>Preformated:</strong>Testing one row
and another
</pre>
<p>I am <a href="?abc123">the a tag</a> example<br>
I am <abbr title="test">the abbr tag</abbr> example<br>
I am <acronym>the acronym tag</acronym> example<br>
I am <b>the b tag</b> example<br>
I am <big>the big tag</big> example<br>
I am <cite>the cite tag</cite> example<br>
I am <code>the code tag</code> example<br>
I am <del>the del tag</del> example<br>
I am <dfn>the dfn tag</dfn> example<br>
I am <em>the em tag</em> example<br>
I am <i>the i tag</i> example<br>
I am <ins>the ins tag</ins> example<br>
I am <kbd>the kbd tag</kbd> example<br>
I am <q>the q tag</q> example<br>
I am <samp>the samp tag</samp> example<br>
I am <small>the small tag</small> example<br>
I am <span>the span tag</span> example<br>
I am <strong>the strong tag</strong> example<br>
I am <sub>the sub tag</sub> example<br>
I am <sup>the sup tag</sup> example<br>
I am <tt>the tt tag</tt> example<br>
I am <var>the var tag</var> example<br>
I am the <span class="small">small class</span> example<br>
I am the <span class="large">large class</span> example<br>
I am the <span class="quiet">quiet class</span> example<br>
I am the <span class="highlight">highlight class</span> example<br></p>
<hr>
<ul>
<li>Unordered list 01</li>
<li>Unordered list 02</li>
<li>Unordered list 03
<ul>
<li>Unordered list inside list level 2</li>
<li>Unordered list inside list level 2
<ul>
<li>Unordered list inside list level 3</li>
<li>Unordered list inside list level 3</li>
</ul>
</li>
</ul>
</li>
</ul>
<ol>
<li>Ordered list 01</li>
<li>Ordered list 02</li>
<li>Ordered list 03
<ol>
<li>Ordered list inside list level 2</li>
<li>Ordered list inside list level 2
<ol>
<li>Ordered list inside list level 3</li>
<li>Ordered list inside list level 3</li>
</ol>
</li>
</ol>
</li>
</ol>
<dl>
<dt>Description list title 01</dt>
<dd>Description list description 01</dd>
<dt>Description list title 02</dt>
<dd>Description list description 02</dd>
<dd>Description list description 03</dd>
</dl>
<table>
<caption>
Table Caption
</caption>
<thead>
<tr>
<th>Table head th</th>
<td>Table head td</td>
</tr>
</thead>
<tfoot>
<tr>
<th>Table foot th</th>
<td>Table foot td</td>
</tr>
</tfoot>
<tbody>
<tr>
<th>Table body th</th>
<td>Table body td</td>
</tr>
<tr>
<td>Table body td</td>
<td>Table body td</td>
</tr>
</tbody>
</table>
<form action="#">
<fieldset>
<legend>Form legend</legend>
<div>
<label for="f1">Text input:</label><br>
<input type="text" id="f1" value="input text">
</div>
<div>
<label for="pw">Password input:</label><br>
<input type="password" id="pw" value="password">
</div>
<div>
<label for="f2">Radio input:</label><br>
<input type="radio" id="f2">
</div>
<div>
<label for="f3">Checkbox input:</label><br>
<input type="checkbox" id="f3">
</div>
<div>
<label for="f4">Select field:</label><br>
<select id="f4">
<option>
Option 01
</option>
<option>
Option 02
</option>
</select>
</div>
<div>
<label for="f5">Textarea:</label><br>
<textarea id="f5" cols="30" rows="5">
Textarea text
</textarea>
</div>
<div>
<label for="f6">Input Button:</label><br>
<input type="button" id="f6" value="button text">
</div>
<div>
<label>Button Elements: <span class="small quiet">Can use <button> tag or <a class="button"></span></label><br>
<button class="button positive"><img src="img/icons/tick.png" alt=""> Save</button> <a class="button" href="#"><img src="img/icons/key.png" alt=""> Change Password</a> <a href="#" class="button negative"><img src="img/icons/cross.png" alt=""> Cancel</a>
</div>
</fieldset>
</form>
I am <a href="something.doc">a word document</a> link, so readers know that I'm not a normal link.<br>
I am <a href="something.pdf">a pdf document</a> link, so readers know that I'm not a normal link.<br>
I am <a href="http://www.something.com">an external website</a> link, so readers know that I'm not a normal link.<br>
I am <a href="something.rss">an rss feed</a> link, so readers know that I'm not a normal link.<br>
I am <a href="something.xls">an excel spreadsheet</a> link, so readers know that I'm not a normal link.<br>
I am <a href="aim:something">an AIM screenname</a> link, so readers know that I'm not a normal link.<br>
I am <a href="mailto:something">an email address</a> link, so readers know that I'm not a normal link.<br>
I am <a href="http://yourwebsite.com">an internal link</a>. Change the stylesheet's "http://yourwebsite.com" to your domain name so I don't look like an external link.<br>
<br>
<p class="success"><img src="img/icons/tick.png" alt=""> This is a paragraph with class="success" and <a href="http://www.something.com">a link</a>.</p>
<p class="error"><img src="img/icons/cross.png" alt=""> This is a paragraph with class="error" and <a href="http://www.something.com">a link</a>.</p>
<p class="notice"><img src="img/icons/information.png" alt=""> This is a paragraph with class="notice" and <a href="http://www.something.com">a link</a>.</p>