🐛 fix Issue ashi009#17

src/nodes/html.ts

@@ -445,15 +445,18 @@ export default class HTMLElement extends Node {
 	 * @param {string|number} value The value to set, or null / undefined to remove an attribute
 	 */
 	setAttribute(key: string, value: string | number) {
-		// Invalidate current this.attributes
-		if (this._attrs) {
-			delete this._attrs;
-		}
 		const attrs = this.rawAttributes;
 		if (value === undefined || value === null) {
 			delete attrs[key];
+			// Update this.attribute
+			if (this._attrs && this._attrs[key]) {
+				delete this._attrs[key];
+			}
 		} else {
 			attrs[key] = String(value);
+			if (this._attrs) {
+				this._attrs[key] = decode(attrs[key]);
+			}
 		}
 		// Update rawString
 		this.rawAttrs = Object.keys(attrs).map((name) => {

test/html.js

@@ -334,10 +334,12 @@ describe('HTML Parser', function () {
 		describe('#setAttribute', function () {
 			it('should edit the attributes of the element', function () {
 				var root = parseHTML('<p a=12></p>');
+				var attr = root.firstChild.attributes;
 				root.firstChild.setAttribute('a', 13);
-				root.firstChild.attributes.should.eql({
+				attr.should.eql({
 					'a': '13',
 				});
+				root.firstChild.getAttribute('a').should.eql('13');
 				root.firstChild.toString().should.eql('<p a="13"></p>');
 			});
 			it('should add an attribute to the element', function () {