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updating read-only property of the
SourceBuffer interface indicates whether the
SourceBuffer is currently being updated — i.e. whether an
SourceBuffer.remove() operation is currently in progress.
var isUpdating = sourceBuffer.updating;
|Media Source Extensions
The definition of 'updating' in that specification.
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|Feature||Chrome||Edge||Firefox (Gecko)||Internet Explorer||Opera||Safari (WebKit)|
|Basic support||23||(Yes)||25.0 (25.0)
|Feature||Android||Edge||Firefox Mobile (Gecko)||Firefox OS (Gecko)||IE Phone||Opera Mobile||Safari Mobile|
|No support||11||30||No support|
 Available after switching the
true. In addition, support was limited to a whitelist of sites, for example YouTube, Netflix, and other popular streaming sites. The whitelist was removed and Media Source Extensions was enabled by default in 42+ for all sites.
 Only works on Windows 8+.