Trouble inspecting structure on some legacy portals – anyone else seen this?

Hi everyone,
I’m currently working on improving accessibility and layout consistency for public utility websites and came across the fesco bill website. While analyzing its structure, I noticed some unusual rendering behavior, especially with how input forms and mobile responsiveness are handled. On top of that, some of the older HTML seems to break when inspected via modern browsers or dev tools, which makes tweaking anything or suggesting improvements challenging. Has anyone else experienced similar issues when working with sites that were likely built on older frameworks or non-semantic markup? I’d really appreciate any insight or even debugging tips when dealing with this kind of front-end legacy.

Define “seems to break”? Do you have an example?

When CSS and JS are tied directly to deprecated tags or outdated libraries, even small changes can break things unexpectedly—sometimes browser compatibility view in Edge helps reveal how it was meant to behave.