OptionalbarSecond row in the last-price tag counting down to the bar's close.
OptionalclockWall-clock UTC seconds. Both readings are times of day, so neither can use
now, which is a monotonic animation clock and not a calendar. Defaults to
the system clock; pass the feed's clock to keep a delayed or replayed chart
honest about what time its data thinks it is.
OptionalsessionLive clock in the corner between the price and time axes. true takes the
defaults; the object form is there for the one thing worth choosing, the
second row carrying the zone's offset from UTC.
Chrome that lives on the axis strips rather than in the plot: a live clock in the corner where the two axes meet, and a countdown to the current bar's close inside the last-price tag.
Both default to off. Neither is a thing a chart should start showing because it upgraded, and a chart that sets none of this draws the axes it always drew.