// keep_parent_background.js
// RJM Programming
// May, 2017
// As an HTML iframe child and parent defines document.body background, and the child has not defined background, adopt that parent one as the background

 function adopt_parent_background_maybe() {
   if (parent.document.body.outerHTML) {
     var parent_style_bits=parent.document.body.outerHTML.split('>')[0].split(' style="');
     if (parent_style_bits.length > 1) {
       var parent_style=(";" + parent_style_bits[1].split('"')[0] + ";").replace(/ ; /g,';').replace(/; /g,';').replace(/ ;/g,';');
       if (parent_style.toLowerCase().indexOf(";background") != -1) {
        if (document.body.outerHTML) {
          var self_style_bits=document.body.outerHTML.split('>')[0].split(' style="');
          if (self_style_bits.length > 1) {
            var self_style=(";" + self_style_bits[1].split('"')[0] + ";").replace(/ ; /g,';').replace(/; /g,';').replace(/ ;/g,';');
            if (self_style.toLowerCase().indexOf(";background") == -1 || 1 == 1) {
              if (parent_style.toLowerCase().indexOf(";background-color:") != -1) {
                document.body.style.backgroundColor=parent_style.toLowerCase().split(";background-color:")[1].split(";")[0].trim();
              }
            }
            if (self_style.toLowerCase().indexOf("url('") == -1) {
              if (parent_style.toLowerCase().indexOf("url('") != -1) {
                var parifs=parent.document.getElementsByTagName('iframe');
                for (var iparifs=0; iparifs<parifs.length; iparifs++) {
                  if (parifs[iparifs].contentWindow === window) { // idea here via http://stackoverflow.com/questions/4691718/determine-current-own-iframe
                    var stylebits = parifs[iparifs].getBoundingClientRect();
                    document.body.style.backgroundPosition=('' + eval(0 - eval(('' + stylebits.left).replace('px','')))).split('.JUNXK')[0] + 'px' + (' ' + eval(0 - eval(('' + stylebits.top).replace('px','')))).split('.JUNXK')[0] + 'px';
                  }
                }
                document.body.style.backgroundImage="url('" + parent_style.replace('URL(','url(').replace('Url(','url(').split("url('")[1].split("'")[0] + "')";
              }
            }
          }
         }
       }
     }
   }
 }
 
 setTimeout(adopt_parent_background_maybe, 2000);