maybe, there's a better way to detect it.

[MYCOIN]

RT

<script type="text/javascript">
var el = new Image();
Object.defineProperty(el, 'id', {
    get: function() {
        alert('active');
    }
});
console.log('%cHello', el);
</script>

[早晨海风]

not support firefox

[Julien GARDET]

Doesn't work after clearing the console.