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A comment on Mvp.css – build your landing page with only semantic HTML. Parent comment

Re:Mvp.css – build your landing page with only semantic HTML by recursive on Saturday November 21, 2020 @11:02AM (#25170371)
I don't think they forgot, because it was never true. It needs a dash `-` in it.

https://html.spec.whatwg.org/#valid-custom-element-name

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Re:Mvp.css – build your landing page with only semantic HTML by folmar on Saturday November 21, 2020 @01:04PM (#25171383)
It needs them now, but it wasn't always the case. In html5-20121025 User agents must treat elements and attributes that they do not understand as semantically neutral.

It was also in the grey area in HTML4.01 spec, note B.1 provides for user agents rendering any unknown elements.

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Re:Mvp.css – build your landing page with only semantic HTML by Conlectus on Saturday November 21, 2020 @01:23PM (#25171577)
Semantically neutral yes, but they are not divs -- they're "unknown elements", which have more annoying behavior (similar to pseudoelements from memory)
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Re:Mvp.css – build your landing page with only semantic HTML by ehnto on Saturday November 21, 2020 @11:44PM (#25175001)
I think that's right. They start out life as inline-block elements.
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