code: function(oSourceInfo, oTargetInfo, iLevel) {
  			iLevel = iLevel ? iLevel : 0;
  
  			ACCInfoHelper._normalize(oSourceInfo);
  			if (iLevel == 0) {
  				ACCInfoHelper._normalize(oTargetInfo);
  				oTargetInfo._descriptions = [];
  			}
  
  			oTargetInfo._descriptions.push(ACCInfoHelper._getFullDescription(oSourceInfo));
  
  			oSourceInfo.children.forEach(function(oChild) {
  				if (!oChild.getAccessibilityInfo || (oChild.getVisible && !oChild.getVisible())) {
  					return;
  				}
  
  				var oChildInfo = oChild.getAccessibilityInfo();
  				if (oChildInfo) {
  					ACCInfoHelper._flatten(oChildInfo, oTargetInfo, iLevel + 1);
  				}
  			});
  
  			if (iLevel == 0) {
  				oTargetInfo.description = oTargetInfo._descriptions.join(" ").trim();
  				oTargetInfo._descriptions = undefined;
  			}
  		}
docs: /*
  Merges the focusable flag and the descriptions of the source and its children into the given target.