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Problem Description: AppendWindowEnd is type Unrestricted Double so can accept NaN as a value. No response to setting as NaN is provided in the spec. A requirement similar to Duration would seem to make sense. It requires returning an error on NaN. Proposed Change: Add to AppendWindowEnd in Section 3.1: 1. If the value being set NaN then throw an INVALID_ACCESS_ERR exception and abort these steps.
Changes committed. https://dvcs.w3.org/hg/html-media/rev/71968956733e