H5P-3662 Add observer for attaching TimelineJS #68
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When merged in, will delay instantiating TimelineJS until the
$container
has been connected to the page'sdocument
Background
Knightlab's Timeline that is used in TimelineJS queries the
document
for theh5p-timeline
element.If that element is not yet attached to the
document
, e.g. because Timeline is used as subcontent and the parent does not attach all subcontents to thedocument
on instantiation but only when needed, TimelineJS crashes.