here is a repro of our issue in a PG example
Recall what we are trying to do is simply not have post-processing affect the background color.
in this example what we are doing is setting the clearcolor to transparent so the CSS DOM background color comes through. You will notice postprocessing is not affecting the background as desired.
However antialiasing seems broken no matter how high the samples.
Also if you turn on DOF, you will see a subtile but noticable hard line/halo artifact.
I get that perhaps the renderer cant blend these post processing pixels with the DOM background but then is there a better solution where we can have a background color that is not impacted by post processing that still anti-aliases and DOFs correctly?