<!DOCTYPE html>
<html>
<head>
<title>example</title>
</head>
<body>
<div style="display: none;">1</div>
<div style="display: none;">2</div>
<div style="display: none;">3</div>
<div style="display: block;">4</div>
<div style="display: none;">5</div>
<script>
var els = document.querySelectorAll('div'), ln = els.length;
for (var i = 0; i < ln; ++i) {
if (els[i].style.display === 'block') {
console.log('yes');
break;
}
}
</script>
</body>
</html>