Retrieving the user interface

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The app recorder uses an XML representation of your app's user interface. You may find it helpful to retrieve this data (UI Dump) to programmatically understand what your app is displaying.
Send a cross-document message with the value dumpUi, for example window.postMessage('dumpUi', '*'). When the UI Dump is ready, the iframe will post a message with type set to uiDump. The value field will be an object with a result string field that contains the XML that represents your app's current user interface. For example:
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// example event.data received by cross-document message handler
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{
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    "type": "uiDump",
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    "value": {
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        "result": "<?xml version='1.0' encoding='UTF-8' ?>..."
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    }
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}
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