| Verifies that UndoManager.addItem() throws JavaScript exceptions. This test requires WebKitTestRunner. |
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| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". |
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| PASS firstFrameDocument.undoManager.addItem(item) threw exception SecurityError: A browsing context is required to add an UndoItem. |
| PASS document.undoManager.addItem(item) did not throw exception. |
| PASS secondFrameDocument.undoManager.addItem(item) threw exception InvalidModificationError: This item has already been added to an UndoManager. |
| Performed undo. |
| Performed redo. |
| PASS successfullyParsed is true |
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| TEST COMPLETE |
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