dataset is also available on SVGElement

[Joozty]

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

The documentation states that the dataset is only available on HTMLElement which seems to be wrong. According to the spec, it is defined on Element

What did you expect to see?

Element.dataset in the heading instead of HTMLElement.dataset

Do you have any supporting links, references, or citations?

https://html.spec.whatwg.org/multipage/dom.html#dom-dataset-dev

const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
svg.dataset
// returns DOMStringMap {}
svg instanceof HTMLElement
// returns false
svg instanceof Element
// returns true

Do you have anything more you want to share?

No response

[sideshowbarker]

Yeah, an element created with a http://www.w3.org/2000/svg namespace is never going to be an HTMLElement.

But if you instead do:

const p = document.createElement("p")
e instanceof HTMLElement
// returns true

And the https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset page documents the dataset property of the HTMLElement object.

The documentation states that the dataset is only available on HTMLElement

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset doesn’t say it’s only available on HTMLElement — instead it just documents that it’s available on HTMLElement, period.

which seems to be wrong. According to the spec, it is defined on Element

https://html.spec.whatwg.org/multipage/dom.html#elements-in-the-dom:dom-dataset documents is as being a member of the HTMLOrSVGElement mixin, and at https://html.spec.whatwg.org/multipage/dom.html#elements-in-the-dom:htmlorsvgelement, the spec documents that the HTMLElement object includes the HTMLOrSVGElement mixin.

https://developer.mozilla.org/en-US/docs/Web/API/SVGElement documents that the SVGElement object has a dataset property.

I guess what’s misleading here is that if you follow the SVGElement.dataset link on that https://developer.mozilla.org/en-US/docs/Web/API/SVGElement, it takes you to the https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset page — and I guess that’s less than ideal, but it’s somewhat a consequence of the fact that we don’t document mixins as such in MDN.

[wbamberg]

I guess what’s misleading here is that if you follow the SVGElement.dataset link on that https://developer.mozilla.org/en-US/docs/Web/API/SVGElement, it takes you to the https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset page — and I guess that’s less than ideal, but it’s somewhat a consequence of the fact that we don’t document mixins as such in MDN.

Yes, this bit is surely just wrong. It's a redirect:

/en-US/docs/Web/API/SVGElement/dataset	/en-US/docs/Web/API/HTMLElement/dataset

Given that we don't document mixins, we have to document the features they contain separately on the interfaces they inherit from. So the best thing to do would be to write a page at https://developer.mozilla.org/en-US/docs/Web/API/SVGElement/dataset, and change that link to point to it.

[Josh-Cena]

Cross linking #6519