<ul id="mainNav">

<li>Home</li>

<li>About Us</li>

<li>Contact</li>

</ul>

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a{text-decoration:underline;}

h1{font-weight:bold;}

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#intro {font-weight:bold;}

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<p id="intro">Some Text</p>

<p class="datePosted">24/3/2006</p>

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#secondaryContent h1{font-size:1.2em;}

<div id="mainContent">

<h1>Welcome to my site</h1>

...</div>

<div id="secondaryContent">

<h1>Latest news</h1>

...

</div>

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a:visited{color:green;}

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tr:hover{background-color:red;}

input:focus{background-color:yellow;}

*{

padding:0;

margin:0;

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#nav>li{background:url(folder.png)no-repeat left top;

<ul id="nav">

<li>Home</li>

<li>Services

<ul>

<li>Design</li>

<li>Development</li>

<li>Consultancy</li>

</ul></li>

<li>Contact Us</li>

</ul>

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#nav li *{background-image:none;}

h1+p{font-weight:bold;}

<h1>Main Heading</h1>

<p>First Paragraph</p>

<p>Second Paragraph</p>