savko-fokin,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(function() {
if($("li[data-tabname = nameTab_draw]").length) {
alert("yes");
}
});
</script>
</head>
<body>
<ul>
<li data-tabname = nameTab_draw ><a href="home.htm">Home</a></li>
<li><a href="products.htm">Products</a></li>
<li><a href="services.htm">Services</a></li>
<li><a href="about.htm">About Us</a></li>
<li><a href="contact.htm">Contact</a></li>
</ul>
</body>
</html>