Remove requirement about <dt> uniqueness

[zcorpan]

What is the issue with the HTML Standard?

https://html.spec.whatwg.org/#the-dl-element:~:text=Within%20a%20single%20dl%20element%2C%20there%20should%20not%20be%20more%20than%20one%20dt%20element%20for%20each%20name

This requirement limits what people can use <dl> for, and I don't see it being useful for catching actual mistakes. I suggest removing it.

For example https://hsivonen.fi/last-html-quirk/ violates it by having "April 1st 2009" twice.

[zcorpan]

@sideshowbarker

[sideshowbarker]

I don't feel strongly about this either way. I can say that I don't remember any issue ever having been raised against the HTML checker for it. But if course that doesn't prove we've not had a lot of people being annoyed by it but just not reporting it.

I vaguely remember when we originally added this (a long long time ago) but I don't remember why. I can imagine it was just under an assumption it was more likely to be the result of somebody doing a copy-paste or initially populate a list, but then forgetting to fill in one of the initial copy-pasted items with their actually-intended text.

Regardless, I wouldn't object to the requirement being dropped.

[tabatkins]

I agree removing this makes sense. The dt functions similarly to a heading for the following dd, and there's no problem with headings having repeated names. As shown in Henri's page, it's a perfectly reasonable thing to do.