voraa, но аналоги работают одинаково. ;)
<!DOCTYPE html>
<html>
<head>
<script src='https://code.jquery.com/jquery-latest.min.js'></script>
<!--
<script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
<link rel="stylesheet" type="text/css" href="tmp.css" />
<script src='tmp.js'></script>
-->
<style>
</style>
<script>
$(_ => {
if ($('.bla-bla-bla')) alert('ok')
if (document.querySelectorAll('.bla-bla-bla')) {
alert('ok')
} else {
alert('no')
}
})
</script>
</head>
<body>
</body>
</html>
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