There is this strange thing happening here in my HTML Id tag and an extra "b3-" is added to the ID tag.The other Div tag also has "b1-" and "b2-" in it. I am not sure why this sis added but I am using these ID in my javascript to need to know what is this In outsystem I have only given the name after "b3-" but here in the browser, this is happenig.Also, this is happening in reactive and this is a outsystem span widget I am using inside a web block. And this is not happening if I am directly using this span widget on the screen.
You cannot use the ID in Outsystems directly. You need to pass the Id as a parameter into your javascript.
like: container.id