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Asked: 2026-05-15T08:30:53+00:00

What web browsers use the __proto__ ? Mozilla states that: Note that __proto__ may

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What web browsers use the __proto__? Mozilla states that:

Note that __proto__ may not be available in JavaScript versions other than that in Mozilla.

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  1. Editorial Team

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    The most general way would be to test this page in different browsers:

    <html>
  <head>
    <script type="text/javascript">
      function a() {}
      if ( (new a).__proto__ === a.prototype )
          alert('supported');
    </script>

  </head>
</html>

    It alerts if a browser supports __proto__. I’ve submitted it to browsershots.org, which will create screenshots of the page in many different browsers. Thus, you should see–by means of the alert message–which browser does support it.

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