Transform flowRegions from Inkscape into foreignObjects

gistfile1.js

// window.onload = init; // This can be overwritten
window.addEventListener("load",init);
 
function init() {
  var texts = document.querySelectorAll("flowRoot");
 
  for (var i = 0; i < texts.length; i++) {
    var t = texts[i];
 
    var rect = t.querySelector("flowRegion > rect");
  
    var fO = document.createElementNS("http://www.w3.org/2000/svg", "foreignObject");
    fO.setAttribute("x",rect.getAttribute("x"));
    fO.setAttribute("y",rect.getAttribute("y"));
    fO.setAttribute("width", rect.getAttribute("width"));
    fO.setAttribute("height", rect.getAttribute("height"));
    fO.setAttribute("transform", t.getAttribute("transform"));
  
    var div = document.createElementNS("http://www.w3.org/1999/xhtml", "div");
    div.setAttribute("xmlns","http://www.w3.org/1999/xhtml");
    div.setAttribute("style", t.getAttribute("style"));
  
    div.innerHTML = t.innerHTML
      .replace(/<flowRegion.*flowRegion>/g,"")
      .replace(/http:\/\/www.w3.org\/2000\/svg/g,"http://www.w3.org/1999/xhtml")
      .replace(/flowPara/g,"div")
      .replace(/flowSpan/g,"span")
    ;
  
    var innerDivs = div.querySelectorAll("div");
  
    for (var j = 0; j < innerDivs.length; j++) {
      var d = innerDivs[j];
      if (d.innerHTML == "") {
        d.innerHTML = "\u200B";
      }
    }
  
    fO.appendChild(div);
  
    t.parentNode.replaceChild(fO, t);
  }
}