Betfair developers finally implemented live chart update for market traded prices and volume on web site. It seems to be not yet final release as yesterday they again switched to the old version: Betfair Price History Graphs
Here is my short video showing how it looks like. Loaded data are limited by size, so not entire price history is loaded, it can be seen on cricket market where amount of loaded data froze web page update for couple seconds.
Betfair should implement other charts representation of chart data similar to stock charts, and also all kinds of time series charts.
We will see later whether betfair decides to release this feature to graphs api: