MVC 6 - Using three HTML encoders

Custom encoder: Custom[[Outer knows 1 < 4]]
Default encoder: Custom[[Inner knows 1 < 4]]

Default encoder: Outer knows <b>2 < 4</b>
Default encoder: Inner knows <b>2 < 4</b>

Null encoder: Outer knows 3 < 4
Default encoder: Inner knows 3 < 4