title: CSS: How to target ::slotted siblings in Shadow DOM root?
body: <p>I know that the spec currently only allows compound selectors for ::slotted, i.e. <code>::slotted(my-first + my-second)</code> is not allowed, but should something like this be working?</p>
  
  <pre><code>::slotted(x-first) + ::slotted(x-second) { /* css */ }
  </code></pre>
  
  <p>Is there any way to target slotted siblings (other than with global css)? And if not, where would I file such a request? Thanks.</p>