Added TemplateElement

lib/DOM/Document.php

@@ -63,11 +63,14 @@ class Document extends \DOMDocument {
 
     public function createElement($name, $value = "") {
         try {
-            $e = parent::createElement($name, $value);
-            if ($name === "template") {
+            if ($name !== 'template') {
+                $e = parent::createElement($name, $value);
+            } else {
+                $e = new TemplateElement($name, $value);
                 $this->templateElements[] = $e;
                 $e->content = $this->createDocumentFragment();
             }
+
             return $e;
         } catch (\DOMException $e) {
             // The element name is invalid for XML
@@ -81,11 +84,14 @@ class Document extends \DOMDocument {
 
     public function createElementNS($namespaceURI, $qualifiedName, $value = "") {
         try {
-            $e = parent::createElementNS($namespaceURI, $qualifiedName, $value);
-            if ($qualifiedName === "template" && $namespaceURI === null) {
+            if ($qualifiedName !== 'template' && $namespaceURI !== null) {
+                $e = parent::createElementNS($namespaceURI, $qualifiedName, $value);
+            } else {
+                $e = new TemplateElement($qualifiedName, $value);
                 $this->templateElements[] = $e;
                 $e->content = $this->createDocumentFragment();
             }
+
             return $e;
         } catch (\DOMException $e) {
             // The element name is invalid for XML

lib/DOM/Element.php

@@ -9,9 +9,6 @@ namespace MensBeam\HTML;
 class Element extends \DOMElement {
     use EscapeString, Moonwalk, Serialize, Walk;
 
-    // Used for template elements
-    public $content = null;
-
     public function setAttribute($name, $value) {
         try {
             parent::setAttribute($name, $value);

lib/DOM/TemplateElement.php

@@ -0,0 +1,12 @@
+<?php
+/** @license MIT
+ * Copyright 2017 , Dustin Wilson, J. King et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace MensBeam\HTML;
+
+/** Class specifically for template elements to handle its content property. */
+class TemplateElement extends Element {
+    public $content = null;
+}

lib/TreeBuilder.php

@@ -3939,7 +3939,7 @@ class TreeBuilder {
     }
 
     public function insertStartTagToken(StartTagToken $token, \DOMNode $intendedParent = null, string $namespace = null): Element {
-        # When the steps below require the user agent to insert a foreign 
+        # When the steps below require the user agent to insert a foreign
         #   element for a token in a given namespace, the user agent must
         #   run these steps:
         // Doing both foreign and HTML elements here because the only