| <html> |
| <link rel="import" href="../resources/chai.html" /> |
| <link rel="import" href="../resources/mocha.html" /> |
| <script> |
| describe('MutationObserver.observe', function() { |
| it('should observe attributes', function() { |
| var observer = new MutationObserver(function() {}); |
| var element = document.createElement('div'); |
| element.setAttribute('data-test', '1'); |
| |
| observer.observe(element, {attributeOldValue: true}); |
| element.setAttribute('data-test', '1'); |
| var records = observer.takeRecords(); |
| assert.equal(records.length, 1); |
| assert.equal(records[0].oldValue, 1); |
| observer.disconnect(); |
| |
| observer.observe(element, {attributeOldValue: false}); |
| element.setAttribute('data-test', '1'); |
| var records = observer.takeRecords(); |
| assert.equal(records.length, 1); |
| assert.isNull(records[0].oldValue); |
| observer.disconnect(); |
| |
| observer.observe(element, {attributeFilter: ['data-test']}); |
| element.setAttribute('data-test', '2'); |
| var records = observer.takeRecords(); |
| assert.equal(records.length, 1); |
| assert.isNull(records[0].oldValue); |
| observer.disconnect(); |
| }); |
| }); |
| </script> |
| </html> |
