1.Tab
<ul>
<li><a href="here.html" tabindex="1">Here</a></li>
<li><a href="there.html" tabindex="3">There</a></li>
<li><a href="limbo.html" tabindex="2">Limbo</a></li>
</ul>
2.Link titles
<p>I'm really bad at writing link text. <a href="inept.html" title="Why I'm rubbish at writing link text: An explanation and an apology.">Click here</a> to find out more.</p>Don’t have links open something in a new window or tab.
3.Access keys
<a href="somepage.html" accesskey="s">Some page</a>“Alt” or “Ctrl” + the access key
4.Skipping HTML
<header>
<h1>The Heading</h1>
<a href="#content">Skip to content</a>
</header>
<nav>
<!--loads of navigation stuff -->
</nav>
<section id="content">
<!--lovely content -->
</section>