Re: [csswg-drafts] [css-break-4] Should fragmentation of block-level replaced-elements be configurable? ("object-slice") (#3404)

We like the proposal to use `break-inside`. I was going to argue for keeping the two values `auto` and `avoid`, with no new value `allow`, and adding something like this in the user-agent stylesheet rules for HTML:
```css
img, svg, math, embed, canvas, object { break-inside: avoid }
```
Easy enough, except `object` is not always replaced - it depends on whether the "fallback content" is rendered.

So I figure you either 1) need to some way to determine whether the fallback content is rendered in object, maybe `object:empty` or `object:valid`, 2) add something like a `:replaced` selector, or 3) add `break-inside: allow` and have `auto` collapse to `avoid` or `allow` based on replacedness, as suggested by @fantasai. I recall that selectors reflecting the load state of the DOM aren't too popular around here, so that leans towards 3.

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