Get the attribute

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Write the code to select the element with data-widget-name attribute from the document and to read its value.

<!DOCTYPE html>
<html>
<body>

  <div data-widget-name="menu">Choose the genre</div>

  <script>
    /* your code */
  </script>
</body>
</html>

<!DOCTYPE html>
<html>
<body>

  <div data-widget-name="menu">Choose the genre</div>

  <script>
    // getting it
    let elem = document.querySelector('[data-widget-name]');

    // reading the value
    alert(elem.dataset.widgetName);
    // or
    alert(elem.getAttribute('data-widget-name'));
  </script>
</body>
</html>