| Subclassing LayoutNode by exposing a new custom property. |
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| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". |
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| Check the node is not dirty by default |
| PASS node.needsLayout is false |
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| node.opacity = 0.5 |
| PASS node.needsLayout is true |
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| Layout will be performed |
| OpacityNode.layout() was called |
| OpacityNode.commitProperty() was called with propertyName = opacity |
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| Layout was performed |
| PASS node.element.style.opacity is "0.5" |
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| node.needsLayout = true |
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| Layout will be performed |
| OpacityNode.layout() was called |
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| Layout was performed |
| PASS successfullyParsed is true |
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| TEST COMPLETE |
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