Sets or gets the beginning point of a sub-clip of a continuous media object.
object.clipBegin = sTime sTime = object.clipBegin
the beginning point of a media object as an offset from the start time. The time must be specified as described in Time Formats.
For the CLIPBEGIN attribute to work, the time2 behavior must be able to seek into the media. Some streaming formats do not support seeking. The canSeek property should indicate whether a media type supports seeking. Some formats, such as streaming media, do not report the correct information regarding their ability to seek.