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No behavior is specified for when a "readAs" method on FileReader is called with invalid input. In Chromium 26.0.1410.40, no exception is thrown and the onerror callback is not invoked. Chromium discussion thread: https://groups.google.com/a/chromium.org/d/topic/chromium-discuss/wEMo0jnlM-w/discussion Chromium behavior discussed on StackOverflow: http://stackoverflow.com/questions/6999928/html5-filereader-functions-not-getting-called
This is defined to throw TypeError. http://dev.w3.org/2006/webapi/WebIDL/#es-interface