Dimension attributes and CSS don't give things intrinsic dimensions

[bzbarsky]

https://html.spec.whatwg.org/multipage/rendering.html#images-3 the second item says:

If the element does not represent an image, but the element already has intrinsic dimensions (e.g. from the dimension attributes or CSS rules)

which doesn't look right. The key part is whether its specified width/height are auto or not. Which is good, because CSS and dimensions attributes don't affect "intrinsic dimensions", as defined at https://drafts.csswg.org/css2/conform.html#intrinsic, by definition.

[bzbarsky]

What Gecko does is check whether both computed width and computed height are length, percent, or calc. If they both are, Gecko does the replaced element thing.