* Add a11y warning `a11y-no-abstract-role` which checks ARIA roles must be non-abstract ARIA role ([#6241](https://github.com/sveltejs/svelte/pull/6241))
* Add a11y warning `a11y-no-interactive-element-to-noninteractive-role` which checks for noninteractive roles used on interactive elements ([#5955](https://github.com/sveltejs/svelte/pull/5955))
* Remove of empty stylesheets created from transitions ([#4801](https://github.com/sveltejs/svelte/issues/4801), [#7164](https://github.com/sveltejs/svelte/issues/7164))
* Disallow invalid CSS selectors starting with a combinator ([#7643](https://github.com/sveltejs/svelte/issues/7643))