Addition to #6046, renamed isHTMLElement to more appropiate naming is…

…DOMElement.

js/parts/Utilities.js

@@ -449,7 +449,7 @@ H.merge = function () {
 					if (
 						H.isObject(value, true) &&
 						!H.isClass(value) &&
-						!H.isHTMLElement(value)
+						!H.isDOMElement(value)
 					) {
 						copy[key] = doCopy(copy[key] || {}, value);
 
@@ -530,12 +530,12 @@ H.isObject = function (obj, strict) {
 /**
  * Utility function to check if an Object is a HTML Element.
  *
- * @function #isHTMLElement
+ * @function #isDOMElement
  * @memberOf Highcharts
  * @param {Object} obj - The item to check.
  * @returns {Boolean} - True if the argument is a HTML Element.
  */
-H.isHTMLElement = function (obj) {
+H.isDOMElement = function (obj) {
 	return H.isObject(obj) && typeof obj.nodeType === 'number';
 };
 
@@ -551,7 +551,7 @@ H.isClass = function (obj) {
 	var c = obj && obj.constructor;
 	return !!(
 		H.isObject(obj, true) &&
-		!H.isHTMLElement(obj) &&
+		!H.isDOMElement(obj) &&
 		(c && c.name && c.name !== 'Object')
 	);
 };

samples/unit-tests/utilities/utilities/demo.js

@@ -364,60 +364,60 @@ QUnit.test('DateFormat', function (assert) {
 });
 
 
-QUnit.test('isHTMLElement', function (assert) {
-    var isHTMLElement = Highcharts.isHTMLElement,
+QUnit.test('isDOMElement', function (assert) {
+    var isDOMElement = Highcharts.isDOMElement,
         // Mock an ES6 class
         classes = {
             constructor: function TestClass() {}
         };
 
     assert.strictEqual(
-      isHTMLElement("a"),
+      isDOMElement("a"),
       false,
       'String is not a HTML Element'
     );
     assert.strictEqual(
-      isHTMLElement(1),
+      isDOMElement(1),
       false,
       'Number is not a HTML Element'
     );
     assert.strictEqual(
-      isHTMLElement(true),
+      isDOMElement(true),
       false,
       'Boolean is not a HTML Element'
     );
     assert.strictEqual(
-      isHTMLElement(null),
+      isDOMElement(null),
       false,
       'null is not a HTML Element'
     );
     assert.strictEqual(
-      isHTMLElement(undefined),
+      isDOMElement(undefined),
       false,
       'undefined is not a HTML Element'
     );
     assert.strictEqual(
-      isHTMLElement([1]),
+      isDOMElement([1]),
       false,
       'Array is not a HTML Element'
     );
     assert.strictEqual(
-      isHTMLElement({ a: 1 }),
+      isDOMElement({ a: 1 }),
       false,
       'Object is not a HTML Element'
     );
     assert.strictEqual(
-      isHTMLElement(classes),
+      isDOMElement(classes),
       false,
       'Object classes is not a HTML Element'
     );
     assert.strictEqual(
-      isHTMLElement(document.createElement('div')),
+      isDOMElement(document.createElement('div')),
       true,
       'HTMLElement is a HTML Element'
     );
     assert.strictEqual(
-      isHTMLElement(function Test() {}),
+      isDOMElement(function Test() {}),
       false,
       'Function is not a HTML Element'
     );