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update click-to-play description
However, because the spec of the propagation of user input flag, which can determine if the function is triggered by the user or not, didn’t be well defined, that causes a compatible problem where we can't play media correctly in some situations. For example, if the play invocation for the element X is triggered inside an async handler, then that invocation would not be treated as a valid user input.
Therefore, we don’t really recommend users this mechanism might cause '''some websites not be able to use this policyplay any media''', and it would be removed once we think “Transient user gesture activation” can achieve good enough user experienceif they requests playing from async handlers. === How do we know if the media is blocked or not?===
When the media is being blocked, there would be a small blocking icon showing near the URL bar.
