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  <title>Number.MAX_SAFE_INTEGER</title>
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  <pre id="out"></pre>
  <script>
    const x = Number.MAX_SAFE_INTEGER + 1;
    const y = Number.MAX_SAFE_INTEGER + 2;
    document.getElementById("out").textContent = [
      String(Number.MAX_SAFE_INTEGER),
      String(x),
      String(x === y)
    ].join("
");
  </script>
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Number.MAX_SAFE_INTEGER — +1 === +2 trap (Try It)