| Document-prototype-currentScript-helper.js | 
           | 
          25 | 
        
        
          | event-path-test-helpers.js | 
          -SR: ShadowRoot  -S: Slot
A ------------------------------- A-SR
+ B ------------ B-SR             + A1 --- A1-SR
  + C            + B1 --- B1-SR   + A2-S   + A1a
  + D --- D-SR     + B1a  + B1b --- B1b-SR
          + D1            + B1c-S   + B1b1
                                    + B1b2
 | 
          2969 | 
        
        
          | shadow-dom-utils.js | 
           | 
          3150 | 
        
        
          | shadow-dom.js | 
           | 
          5341 |