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Fix typo
For example, when a user clicks the element X, then we only allow a website to start the element X from a function that is in the call stack based on the X's “click” event handler.
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 wasn't 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, this mechanism might cause '''some websites not be able to play any media''', if they requests playing from async handlers.
== How do we know if the media is blocked or not? ==
