<h1 id="hello">Hello</h1>

​

<script type="text/javascript">

​

// Guard against double DOM loads

var codeExecuted = false;

​

document.addEventListener('DOMContentLoaded', function(e) {

​

  // Check if importmap stuff exisits without throwing an error.

  // Then run main code w/ guard against multiple executions.

  if ("importmapScriptsLoaded" in window) { 

​

    if (!codeExecuted) {

      // Main code here

      console.log($('#hello'));

​

      // Don't forget to bump guard for one-time only JS execution !!

      codeExecuted = true; 

    };  

  };

​

});

</script>