Don't nest inside placeholder selectors #77
Description
https://sass-lang.com/documentation/style-rules/placeholder-selectors
We are using placeholder selectors throughout our components, however, we are not gaining much from how we use them and they can potentially cause issues.
We have seen in tests running in selenium webdriver using the chrome driver that placeholder selectors in combination with nested classes and extends can cause odd behavior.
The main benefits from placeholder selectors seem to be composability and "atomic" structure. We tend to write styles using a BEM style where you have a base "Block" and then "modifiers" change things when added on. Therefore we always know a placeholder will be used so the benefit of it getting excluded from compile time is not really gained.