This API lets MediaSource apps more effectively customize the HTMLMediaElement.seekable range logic by providing (or removing) a single seekable range that is union'ed with the current buffered ranges to result in a single seekable range which fits both, when media duration is infinite.




Specification link

Final published standard: Recommendation, Living Standard, Candidate Recommendation, or similar final form

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.



The spec change was kept simple to not break existing HTMLMediaElement behavior for seekable. New behavior occurs only if the new {set,clear}LiveSeekableRanges API is used on the MediaSource attached to that HTMLMediaElement and the media duration is positive infinity.

Search tags

MSE, MediaSource, seekable, live, setLiveSeekableRange, clearLiveSeekableRange, liveseekablerange,

Last updated on 2021-05-05