How to get the cell-color of a TWebStringGrid

WEB TMS WEB Core
1

I can set the color of a specific cell
Grid1.CellElements[ACol,ARow].style.setProperty('background-color','red');

but how can the current color be read back?
something like this doesn't work:
Grid1.CellElements[ACol,ARow].style.getProperty('background-color');

Reason:
I want to flash a specific cell a few times by alternating the color.