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diff --git a/ext/bg/js/native-simple-dom-parser.js b/ext/bg/js/native-simple-dom-parser.js
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+/*
+ * Copyright (C) 2020 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+class NativeSimpleDOMParser {
+ constructor(content) {
+ this._document = new DOMParser().parseFromString(content, 'text/html');
+ }
+
+ getElementById(id, root=null) {
+ return (root || this._document).querySelector(`[id='${id}']`);
+ }
+
+ getElementByTagName(tagName, root=null) {
+ return (root || this._document).querySelector(tagName);
+ }
+
+ getElementsByTagName(tagName, root=null) {
+ return [...(root || this._document).querySelectorAll(tagName)];
+ }
+
+ getElementsByClassName(className, root=null) {
+ return [...(root || this._document).querySelectorAll(`.${className}`)];
+ }
+
+ getAttribute(element, attribute) {
+ return element.hasAttribute(attribute) ? element.getAttribute(attribute) : null;
+ }
+
+ getTextContent(element) {
+ return element.textContent;
+ }
+}