"The effect of this algorithm is that any unscoped styles, declared in a shadow DOM subtrees, are applied neither to document nor the subtree in which they are declared."

This is proven to be confusing and weird. Instead, we should change to:

1) <style> elements are not ignored, but instead are automatically scoped to the shadow DOM subtree
2) <style scoped> elements work just as spec'd for a document tree, instead of having a special behavior in relation to shadow DOM subtree