2.1.104 [W3C-HTML52] Section 8.2.5.4.7. The "in body" insertion mode

V0312: node is not removed from the list of active formatting elements

The specification states:

 8.2.5.4.7 The "in body" insertion mode
     ...
     The adoption agency algorithm, which takes as its only argument ... for which the 
     algorithm is being run, consists of the following steps:
         ...
         ...  Let node and last node be furthest block. Follow these steps:
             ...
             5.  If inner loop counter is greater than three and node is in the list of 
                 active formatting elements, then remove node from the list of active 
                 formatting elements.

EdgeHTML Mode

node is not removed from the list of active formatting elements.