o dpvc at https://github.com/mathjax/MathJax/issues/1737-->
        if (MathJax.Hub.Browser.isSafari && parseInt(MathJax.Hub.Browser.webkit) >= 603) {
  MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready", function () {
    var HTMLCSS = MathJax.OutputJax["HTML-CSS"];
    var MML = MathJax.ElementJax.mml;
    var toHTML = MML.mo.prototype.toHTML;
    MML.mo.Augment({
      toHTML: function (span) {
        span = toHTML.call(this,span);
        if (span.bbox.w === 0 && span.bbox.lw < 0 && span.firstChild)