| Tests whether immutable properties can not be modified. | |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". | |
| PASS viewport.x is 0 | |
| PASS viewport.x is 100 | |
| PASS svgDoc.documentElement.viewport.x is 0 | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |