| Shadow DOM related elements should be hidden if the feature is off. | |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". | |
| PASS 0 <= content.constructor.toString().indexOf('HTMLUnknownElement') is true | |
| PASS 0 <= shadow.constructor.toString().indexOf('HTMLUnknownElement') is true | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |