Another way that I tested and it's working is to use https://www.bottlecaps.de/convert/ paste the postgresql grammar there and press "convert" and after press "view diagram".
I tried this out and I'm pleased to see that one of the outputs is xhtml + SVG, because SVGs have hover-over tool-tips, which are an important aspect of accessibility, which was my major concern the last time a similar thing was proposed [1].