third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/iframe-register-link-element.html

<script>
'use strict';
var link = document.createElement('link');
link.setAttribute('rel', 'serviceworker');
link.setAttribute('href', 'empty-worker.js');
function report(result) {
    top.postMessage({id: location.search, result: result}, '*');
};
link.onload = function() {
    report('loaded');
};
link.onerror = function() {
    report('error');
};
document.getElementsByTagName('head')[0].appendChild(link);
</script>