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<script>
var callback;
// Creates a <script> element with |url| source, and returns a promise for the
// result of the executed script. Uses JSONP because some responses to |url|
// are opaque so their body cannot be tested directly.
function getJSONP(url) {
var sc = document.createElement('script');
sc.src = url;
var promise = new Promise(function(resolve, reject) {
// This callback function is called by appending a script element.
callback = resolve;
sc.addEventListener(
'error',
function() { reject('Failed to load url:' + url); });
});
document.body.appendChild(sc);
return promise;
}
</script>
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