How to create an HTML button that acts like a Link?

Put it in a <form> wherein you specify the desired target URL in the action attribute.

<form action="http://google.com">
    <input type="submit" value="Go to Google">
</form>

<a class="btn" href="">Link</a>
<button class="btn" type="submit">Button</button>
<input class="btn" type="button" value="Input">
<input class="btn" type="submit" value="Submit">

Bootstrap (v2) sample appearance:

<button onclick="location.href='http://www.example.com'">
     www.example.com</button>

<a href="http://www.stackoverflow.com/">
    <button>click me</button>
</a>

Edit 22-06-2013: This markup is no longer valid in HTML5 and will neither validate nor always work as potentially expected. Use another approach.

<form>
<input TYPE="button" VALUE="Home Page"
     onclick="window.location.href='http://www.wherever.com'"> 
</form>

Try   It