This was done with the HTML (5) parser. https://hsivonen.fi/html5-gecko-build/ https://hsivonen.fi/html5-gecko-build/ There is the standards based code path and

This was done with the HTML (5) parser. https://hsivonen.fi/html5-gecko-build/ https://hsivonen.fi/html5-gecko-build/ There is the standards based code path and the quirks path.