frameset-remove-col.html

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<!DOCTYPE html>

<html class="reftest-wait">

  <head>

    <meta charset=utf-8>

    <script type="text/javascript">

      window.addEventListener("MozReftestInvalidate", () => {

        let frameset = document.getElementById("frameset");

        frameset.removeChild(frameset.lastChild);

        frameset.cols = frameset.cols.replace(/,[^,]*$/, "");

        document.documentElement.removeAttribute("class");

});

    </script>

  </head>

  <frameset id="frameset" cols="*,*,*">

    <frame />

    <frame />

    <frame />

  </frameset>

</html>