Test if links are external with JavaScript

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var internalLinkPattern = new RegExp(location.host);
var links = document.querySelectorAll('a');
for (var i = 0; i < links.length; i++) {
    var link = links[i];
    internalLinkPattern.test(link.href) ?
        link.setAttribute('data-target', 'internal') :
        link.setAttribute('data-target', 'external');
}
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