Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?

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The following are two methods of building a link that has the sole purpose of running JavaScript code. Which is better, in terms of functionality, page load speed, validation purposes, etc.?

function myJsFunc() {
    alert("myJsFunc");
}
<a href="#" onclick="myJsFunc();">Run JavaScript Code</a>

or

function myJsFunc() {
    alert("myJsFunc");
}
 <a href="https://stackoverflow.com/questions/134845/javascript:void(0)" onclick="myJsFunc();">Run JavaScript Code</a>

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