Merged conflicts with Igor's code

src/parameters/contracts.js

         new Param("br-headerfirstpageonly",["table"]),
         new Param("br-landscapetable",["table"]),
         new Param("br-transformrotate",["div", "table"]),
-        new Param("br-isolatedlandscape",["div", "table"])
+        new Param("br-isolatedlandscape",["div", "table"]),
+        new Param("br-hidechildren",["div"])
     ];
 }
 

src/transformations/hide-children/hide-child.css

+@media print{
+    .hide-child{
+         display: none !important;
+    }
+}

src/transformations/hide-children/hide-children.js

+import './hide-child.css';
+import { Transform } from "../transform";
+import $ from 'jquery';
+
+export class Hidechildren extends Transform {
+    constructor(param) {
+        super(param);
+        this.object = param.object;
+        this.children = this.object.children;
+        this.class = null;
+    }
+
+    execute() {
+        for (var i = 0; i < this.children.length; i++) {
+            if (this.children[i].attributes.code) {
+                if (this.children[i].attributes.code.value !== "keep") {
+                    $(this.children[i]).addClass('hide-child');
+                }
+            }else{
+                $(this.children[i]).addClass('hide-child');
+            }
+        }
+        this.class = this.object.parentElement.attributes.class.value;
+        $(this.object.parentElement).removeClass();
+    }
+
+    rolback() {
+        for (var i = 0; i < this.children.length; i++) {
+            $(this.children[i]).removeClass('hide-child');
+            if (this.class) {
+                $(this.object.parentElement).addClass(this.class);
+            }
+        }
+    }
+}

src/transforms-factory.js

 import { HeaderFirstPageOnlyTransform } from "./transformations/header-transformations/header-first-page-only-transformation";
 import { TransformRotate } from "./transformations/transform-rotate";
 import { IsolatedLandscapeTransformation } from "./transformations/isolated-landscape-transformation";
+import { Hidechildren } from "./transformations/hide-children/hide-children";
 
 export class TransformsFactory {
    produce(code, object, selectors) {
             return new TransformRotate(param);
          case "br-isolatedlandscape":
             return new IsolatedLandscapeTransformation(param);
+         case "br-hidechildren":
+            return new Hidechildren(param);
       }
 
       return null;