CSS in comments is not ignored by Polymer.

[ktiedt]

      /*paper-submenu::shadow paper-item::shadow iron-icon {
        position: absolute;
        top: 4px;
      }*/

Just an example, the above CSS continued to be perpetuated to the element despite comments.

[ebidel]

/sub

[TimvdLippe]

In #2473 a testcase was added to test the reported bug, however CI reports it is working correctly. Additional replication steps would be needed to narrow down a bug, or this issue could be closed via the PR?

[ktiedt]

I just tested this and either the problem is fixed or, there was some other underlying cause, but definitely closeable from my perspective.