I did my work in HTML/CSS/JS (and some PHP for the imagemagick stuff in this case), which the engineering team then had to adjust to fit the code their templates could output.
I don't recall much detail about how WebObjects was viewed. I do remember that at the time the store used a version of WebObjects that could only run on old hardware, so there was an impending deadline for a total re-write before the hardware stopped being available. I've no idea if they did that rewrite or swapped to a different system altogether.