[w3c/screen-orientation] Clarification on animation frame task (#136)

Currently in the spec we have:

>  <p>
>         The following is used but not defined in [[FULLSCREEN]]: <dfn><a href=
>         'https://github.com/whatwg/fullscreen/issues/16'>animation frame
>         task</a></dfn>.
>       </p>

According to the fullscreen issue referenced above the timing is now defined and the issue has been closed.

@foolip Would you please be able to clarify what this means for the definition in the Screen Orientation spec and also where animation frame task appears in the algorithms:

>   <p>If locking the orientation did not result in a change of
>           orientation, as part of the next <a>animation frame task</a>, resolve
>           <var>pending-promise</var> with <code>undefined</code> and set <var>
>             pending-promise</var> to <code>null</code>.
>           </p>        

> <p>
>           Whenever the viewport's angle changes, the <a>user agent</a> MUST run
>           the following steps as part of the next <a>animation frame task</a>:
>         </p>

> <p>
>           Whenever a <a>document</a> becomes visible per [[!PAGE-VISIBILITY]],
>           in other words after the <a>now visible algorithm</a> is run, the
>           <a>user agent</a> MUST run the following substeps as part of the next
>           <a>animation frame task</a>:
>         </p>

Thank you very much for your help 🙂


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