According to the spec [1], implement the `show-poster-flag` which is used to decide whether we need to run `TimeMarchesOn` algorithm under certain situations. [1] https://html.spec.whatwg.org/multipage/media.html#show-poster-flag rchesOn` algorithm under certain situations.
Bug 1531863 Comment 3 Edit History
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According to the spec [1], implement the `show-poster-flag` which is used to decide whether we need to run `TimeMarchesOn` algorithm under certain situations. [1] https://html.spec.whatwg.org/multipage/media.html#show-poster-flag