If you are seeing this issue in CodePen, you need to use
target="_blank" in your hyperlinks. That could be one reason for the failure.
Another possible reason: It is invalid HTML to nest a
<button> inside of an
<a> tag (and vice-versa). The
<a> tag cannot contain interactive content like buttons, iframes, videos, input elements, etc. You can style your hyperlinks to look like buttons if that’s the effect you are looking for.
Assuming you’re using bootstrap and want your hyperlinks to look like buttons, use this code:
<a class="btn btn-primary" href="http://www.linkedin.com/in/jeff-suwak-277546124/" target="_blank">LinkedIn</a>
<a class="btn btn-primary" href="http://www.twitter.com/ghostelectrics" target="_blank">Twitter</a>
(and feel free to replace
btn btn-primary with your own CSS class to style your links as needed)