Comment by _heimdall

I don't know the HN codebase, but based on the HTML validation results I'd be surprised if it took more than a day or two to fix most or all of the issues.

Almost all of the warning and errors are related to using obsolete Element attributes and invalid <table> definitions. Those shouldn't need any larger rework to clean up.

I don't say this trying to imply that HN needs to fix these or are being lazy in not doing it. YC has priorities and provide HN for free. It's totally up to them whether fixes are worth it, I just wouldn't expect it to be a huge lift.