HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.error — plugin</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 460px; }
    p { padding: 12px; border-radius: 6px; background: #f1f5f9; }
    button { margin: 6px 6px 0 0; padding: 8px 12px; cursor: pointer; border-radius: 6px; border: 1px solid #cbd5e1; background: #fff; }
    #out { margin-top: 12px; padding: 12px; background: #f8fafc; border-radius: 8px; white-space: pre-wrap; font-size: 13px; }
  </style>
</head>
<body>
  <p id="target">Spotlight target</p>
  <button type="button" id="bad">Call without color</button>
  <button type="button" id="good">Call with color</button>
  <div id="out"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $.fn.spotlight = function ( options ) {
      if ( !options || !options.color ) {
        jQuery.error( "spotlight: options.color is required" );
      }
      return this.css( "background-color", options.color );
    };
    $( "#bad" ).on( "click", function () {
      try {
        $( "#target" ).spotlight( {} );
      } catch ( err ) {
        $( "#out" ).text( "Invalid: " + err.message );
      }
    });
    $( "#good" ).on( "click", function () {
      $( "#target" ).spotlight( { color: "#fde68a" } );
      $( "#out" ).text( "Valid: background set to #fde68a" );
    });
  </script>
</body>
</html>

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jQuery.error() — plugin validation (Try It)