how to use linkup in button code example

Example 1: button as href

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

Example 2: button href

a.button {
    -webkit-appearance: button;
    -moz-appearance: button;
    appearance: button;

    text-decoration: none;
    color: initial;
}