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Site fails on IE9

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PV Mapper doesn't work on Internet Explorer 9.

First it shows a warning that IndexedDB is not available, which will forbid any local storage. This wasn't an issue when IndexedDB only stored local KML files, which users could re-add during their next session. However, IndexDB now stores all local configuration. Is there a polyfill or other backward compatible partial fix for storing this configuration data on IE9?

Second, after the warning popup, no scoreboard appears. I assume this is directly related to the IndexedDB issue, which may be preventing tools from running correctly. No errors were shown in the console. It may be a separate issue, but it will also need to be fixed to support IE9.

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