This is a testharness.js-based test.
Found 147 tests; 144 PASS, 3 FAIL, 0 TIMEOUT, 0 NOTRUN.
PASS Partial interface URL: original interface defined
PASS Partial interface URL: valid exposure set
PASS Partial interface AudioTrack: original interface defined
PASS Partial interface VideoTrack: original interface defined
PASS Partial interface TextTrack: original interface defined
PASS URL interface: operation createObjectURL(MediaSource)
PASS Unscopable handled correctly for createObjectURL(MediaSource) on URL
PASS AudioTrack interface: attribute sourceBuffer
PASS Unscopable handled correctly for sourceBuffer property on AudioTrack
PASS VideoTrack interface: attribute sourceBuffer
PASS Unscopable handled correctly for sourceBuffer property on VideoTrack
FAIL TextTrack interface: attribute sourceBuffer assert_true: The prototype object must have a property "sourceBuffer" expected true got false
PASS Unscopable handled correctly for sourceBuffer property on TextTrack
PASS MediaSource interface: existence and properties of interface object
PASS MediaSource interface object length
PASS MediaSource interface object name
PASS MediaSource interface: existence and properties of interface prototype object
PASS MediaSource interface: existence and properties of interface prototype object's "constructor" property
PASS MediaSource interface: existence and properties of interface prototype object's @@unscopables property
PASS MediaSource interface: attribute sourceBuffers
PASS Unscopable handled correctly for sourceBuffers property on MediaSource
PASS MediaSource interface: attribute activeSourceBuffers
PASS Unscopable handled correctly for activeSourceBuffers property on MediaSource
PASS MediaSource interface: attribute readyState
PASS Unscopable handled correctly for readyState property on MediaSource
PASS MediaSource interface: attribute duration
PASS Unscopable handled correctly for duration property on MediaSource
PASS MediaSource interface: attribute onsourceopen
PASS Unscopable handled correctly for onsourceopen property on MediaSource
PASS MediaSource interface: attribute onsourceended
PASS Unscopable handled correctly for onsourceended property on MediaSource
PASS MediaSource interface: attribute onsourceclose
PASS Unscopable handled correctly for onsourceclose property on MediaSource
PASS MediaSource interface: operation addSourceBuffer(DOMString)
PASS Unscopable handled correctly for addSourceBuffer(DOMString) on MediaSource
PASS MediaSource interface: operation removeSourceBuffer(SourceBuffer)
PASS Unscopable handled correctly for removeSourceBuffer(SourceBuffer) on MediaSource
PASS MediaSource interface: operation endOfStream(EndOfStreamError)
PASS Unscopable handled correctly for endOfStream(EndOfStreamError) on MediaSource
PASS MediaSource interface: operation setLiveSeekableRange(double, double)
PASS Unscopable handled correctly for setLiveSeekableRange(double, double) on MediaSource
PASS MediaSource interface: operation clearLiveSeekableRange()
PASS Unscopable handled correctly for clearLiveSeekableRange() on MediaSource
PASS MediaSource interface: operation isTypeSupported(DOMString)
PASS Unscopable handled correctly for isTypeSupported(DOMString) on MediaSource
PASS MediaSource must be primary interface of mediaSource
PASS Stringification of mediaSource
PASS MediaSource interface: mediaSource must inherit property "sourceBuffers" with the proper type
PASS MediaSource interface: mediaSource must inherit property "activeSourceBuffers" with the proper type
PASS MediaSource interface: mediaSource must inherit property "readyState" with the proper type
PASS MediaSource interface: mediaSource must inherit property "duration" with the proper type
PASS MediaSource interface: mediaSource must inherit property "onsourceopen" with the proper type
PASS MediaSource interface: mediaSource must inherit property "onsourceended" with the proper type
PASS MediaSource interface: mediaSource must inherit property "onsourceclose" with the proper type
PASS MediaSource interface: mediaSource must inherit property "addSourceBuffer(DOMString)" with the proper type
PASS MediaSource interface: calling addSourceBuffer(DOMString) on mediaSource with too few arguments must throw TypeError
PASS MediaSource interface: mediaSource must inherit property "removeSourceBuffer(SourceBuffer)" with the proper type
PASS MediaSource interface: calling removeSourceBuffer(SourceBuffer) on mediaSource with too few arguments must throw TypeError
PASS MediaSource interface: mediaSource must inherit property "endOfStream(EndOfStreamError)" with the proper type
PASS MediaSource interface: calling endOfStream(EndOfStreamError) on mediaSource with too few arguments must throw TypeError
PASS MediaSource interface: mediaSource must inherit property "setLiveSeekableRange(double, double)" with the proper type
PASS MediaSource interface: calling setLiveSeekableRange(double, double) on mediaSource with too few arguments must throw TypeError
PASS MediaSource interface: mediaSource must inherit property "clearLiveSeekableRange()" with the proper type
PASS MediaSource interface: mediaSource must inherit property "isTypeSupported(DOMString)" with the proper type
PASS MediaSource interface: calling isTypeSupported(DOMString) on mediaSource with too few arguments must throw TypeError
PASS SourceBuffer interface: existence and properties of interface object
PASS SourceBuffer interface object length
PASS SourceBuffer interface object name
PASS SourceBuffer interface: existence and properties of interface prototype object
PASS SourceBuffer interface: existence and properties of interface prototype object's "constructor" property
PASS SourceBuffer interface: existence and properties of interface prototype object's @@unscopables property
PASS SourceBuffer interface: attribute mode
PASS Unscopable handled correctly for mode property on SourceBuffer
PASS SourceBuffer interface: attribute updating
PASS Unscopable handled correctly for updating property on SourceBuffer
PASS SourceBuffer interface: attribute buffered
PASS Unscopable handled correctly for buffered property on SourceBuffer
PASS SourceBuffer interface: attribute timestampOffset
PASS Unscopable handled correctly for timestampOffset property on SourceBuffer
PASS SourceBuffer interface: attribute audioTracks
PASS Unscopable handled correctly for audioTracks property on SourceBuffer
PASS SourceBuffer interface: attribute videoTracks
PASS Unscopable handled correctly for videoTracks property on SourceBuffer
FAIL SourceBuffer interface: attribute textTracks assert_true: The prototype object must have a property "textTracks" expected true got false
PASS Unscopable handled correctly for textTracks property on SourceBuffer
PASS SourceBuffer interface: attribute appendWindowStart
PASS Unscopable handled correctly for appendWindowStart property on SourceBuffer
PASS SourceBuffer interface: attribute appendWindowEnd
PASS Unscopable handled correctly for appendWindowEnd property on SourceBuffer
PASS SourceBuffer interface: attribute onupdatestart
PASS Unscopable handled correctly for onupdatestart property on SourceBuffer
PASS SourceBuffer interface: attribute onupdate
PASS Unscopable handled correctly for onupdate property on SourceBuffer
PASS SourceBuffer interface: attribute onupdateend
PASS Unscopable handled correctly for onupdateend property on SourceBuffer
PASS SourceBuffer interface: attribute onerror
PASS Unscopable handled correctly for onerror property on SourceBuffer
PASS SourceBuffer interface: attribute onabort
PASS Unscopable handled correctly for onabort property on SourceBuffer
PASS SourceBuffer interface: operation appendBuffer(BufferSource)
PASS Unscopable handled correctly for appendBuffer(BufferSource) on SourceBuffer
PASS SourceBuffer interface: operation abort()
PASS Unscopable handled correctly for abort() on SourceBuffer
PASS SourceBuffer interface: operation changeType(DOMString)
PASS Unscopable handled correctly for changeType(DOMString) on SourceBuffer
PASS SourceBuffer interface: operation remove(double, unrestricted double)
PASS Unscopable handled correctly for remove(double, unrestricted double) on SourceBuffer
PASS SourceBuffer must be primary interface of sourceBuffer
PASS Stringification of sourceBuffer
PASS SourceBuffer interface: sourceBuffer must inherit property "mode" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "updating" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "buffered" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "timestampOffset" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "audioTracks" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "videoTracks" with the proper type
FAIL SourceBuffer interface: sourceBuffer must inherit property "textTracks" with the proper type assert_inherits: property "textTracks" not found in prototype chain
PASS SourceBuffer interface: sourceBuffer must inherit property "appendWindowStart" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "appendWindowEnd" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "onupdatestart" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "onupdate" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "onupdateend" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "onerror" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "onabort" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "appendBuffer(BufferSource)" with the proper type
PASS SourceBuffer interface: calling appendBuffer(BufferSource) on sourceBuffer with too few arguments must throw TypeError
PASS SourceBuffer interface: sourceBuffer must inherit property "abort()" with the proper type
PASS SourceBuffer interface: sourceBuffer must inherit property "changeType(DOMString)" with the proper type
PASS SourceBuffer interface: calling changeType(DOMString) on sourceBuffer with too few arguments must throw TypeError
PASS SourceBuffer interface: sourceBuffer must inherit property "remove(double, unrestricted double)" with the proper type
PASS SourceBuffer interface: calling remove(double, unrestricted double) on sourceBuffer with too few arguments must throw TypeError
PASS SourceBufferList interface: existence and properties of interface object
PASS SourceBufferList interface object length
PASS SourceBufferList interface object name
PASS SourceBufferList interface: existence and properties of interface prototype object
PASS SourceBufferList interface: existence and properties of interface prototype object's "constructor" property
PASS SourceBufferList interface: existence and properties of interface prototype object's @@unscopables property
PASS SourceBufferList interface: attribute length
PASS Unscopable handled correctly for length property on SourceBufferList
PASS SourceBufferList interface: attribute onaddsourcebuffer
PASS Unscopable handled correctly for onaddsourcebuffer property on SourceBufferList
PASS SourceBufferList interface: attribute onremovesourcebuffer
PASS Unscopable handled correctly for onremovesourcebuffer property on SourceBufferList
PASS SourceBufferList must be primary interface of mediaSource.sourceBuffers
PASS Stringification of mediaSource.sourceBuffers
PASS SourceBufferList interface: mediaSource.sourceBuffers must inherit property "length" with the proper type
PASS SourceBufferList interface: mediaSource.sourceBuffers must inherit property "onaddsourcebuffer" with the proper type
PASS SourceBufferList interface: mediaSource.sourceBuffers must inherit property "onremovesourcebuffer" with the proper type
Harness: the test ran to completion.