Thank you for your reply.
Let me confirm what I understand about the webkit behavior of "duration update":
>When the length of the media resource changes to a known value (e.g., from
I think WebKit’s behavior matches the spec.
The HTML5 spec says: “If no media data is available, then the attributes must
return the Not-a-Number (NaN) value.” On the test page, there is no data
appended to the media source, so there is no media data available for the video
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