[csswg-drafts] [css-background] Multi-layer and border style/radius support for border-image (#8802)

LemmaEOF has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-background] Multi-layer and border style/radius support for border-image ==
Spec: https://w3c.github.io/csswg-drafts/css-backgrounds/#border-images

The current state of `border-image` is...less than stellar. There are two main problems I've run into:

1. Unlike `background-image`, border image sources cannot be layered.
2. Border images are fully unaffected by `border-style` and `border-radius`.

The former is a simple parity issue - the value of border-image-source could be converted from `none | <image>` to `<bg-image>#`  without breaking existing CSS, and the other border-image properties could be made to support groups as well.

While the latter makes a lot of sense for using a sliced image, this becomes an issue if you want to use a gradient as a border - as `<gradient>` is a subtype of `<image>`, this results in gradient borders being unable to use the features you'd use with a solid-colored or hidden border. While there are workarounds, they're not pretty - take for [example this post from blep on cohost](https://cohost.org/blep/post/1445650-gui-design-thin).

I'm not quite sure of an optimal solution for this, as changing it would inherently change the visual presentation of any websites that use the current behavior. However, I feel it's still important to consider, as design trends like neumorphism are starting to bring back gradients in ways where having a gradient border with a radius would be desirable.

I'm new to spec proposals, so please don't hesitate to let me know if I've missed anything! Thank you for your time!

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/8802 using your GitHub account


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Received on Friday, 5 May 2023 20:00:50 UTC