Emmet overrides affect global settings

Due to the need for fewer implicit attributes in Emmet-generated nodes, various overrides are provided at the time components are wrapped. These overrides have a global impact on how Emmet works and may have effects on other components utilizing the same Emmet instance.

It may be possible to scope these overrides to the limited execution context of assertions, or otherwise to roll back any changes to existing settings. This is considered low priority until users indicate that this is in fact important to them.