add App.UI.DOM.createElement and App.UI.DOM.appendNewElement

src/js/utilsDOM.js

@@ -122,6 +122,38 @@ App.UI.DOM.disabledLink = function(link, reasons) {
 	return res;
 };
 
+/**
+ * @param {string} tag - valid HTML tag
+ * @param {string|Node} content
+ * @param {string|Array<string>} classNames
+ * @returns {Node}
+ */
+App.UI.DOM.createElement = function(tag, content, classNames) {
+	const element = document.createElement(tag);
+	if (classNames !== undefined) {
+		if (Array.isArray(classNames)) {
+			r.classList.add(...classNames);
+		} else {
+			r.classList.add(classNames);
+		}
+	}
+	element.append(content);
+	return element;
+};
+
+/**
+ * @param {string|Node} content
+ * @param {string} tag - valid HTML tag
+ * @param {ParentNode} parent
+ * @param {string|Array<string>} classNames
+ * @returns {Node}
+ */
+App.UI.DOM.appendNewElement = function(content, tag, parent, classNames) {
+	const element = App.UI.DOM.makeElement(content, tag, classNames);
+	parent.append(element);
+	return element;
+};
+
 /**
  * @param {string} text
  * @param {string|string[]} [classNames]