How does JavaScript detect whether a video failed to load?

A video tag, how to detect whether it failed to load? I monitored the onerror event, and it can be triggered if the resource is 404, but if the page is rendered and then the network is disconnected, the video will not be opened and the error event will not be triggered. Because at this time, some of the video resources have already been loaded.

Mar.18,2021

try this? clipboard.png

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