Update 16-09-19TPAC-1.md

Author: hayatoito

meetings/16-09-19TPAC-1.md

@@ -46,8 +46,17 @@ Dominic (Google): `<button>` produces something that is focusable and has an ARI
   - Participate in form submission.
 
 ### Shadow DOM feature requests for v2
-- https://github.com/w3c/webcomponents/issues/300
-- https://github.com/w3c/webcomponents/issues/479
+
+- `<iframe>` and the History API
+  - https://github.com/w3c/webcomponents/issues/184
+- [Optional topic] Support Custom Pseudo-elements
+  - https://github.com/w3c/webcomponents/issues/300
+  - It looks there is no strong interests on this.
+- [Optional topic] {DocumentOrShadowRoot or Slot}.activePath
+  - https://github.com/w3c/webcomponents/issues/479
+  - It looks there is no strong interests on this.
+
+----
 
 Please add your name, and agenda requests here by [editing a branch and making a Pull Request](https://github.com/w3c/WebPlatformWG/blob/gh-pages/meetings/16-09-19TPAC-1.md), or by mail to either the public-webapps mailing list or the chairs of the Web Platform group, which will result in it being posted here.