Check XDomainRequest with 404-file
by drublic
HTML
<p>The next paragraph should be red.</p>
<p id="output">Test.</p>
JavaScript
var src = 'http://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js';
try {
$.getScript(src, function(xhr, status) {
$('#output').css('backgroud', 'red');
});
} catch(err) {
$('#output').css('backgroud', 'red');
}