pe: Object,
							value: null,
							observer: '_positionableTargetChanged'
						}
					},
					// *REQUIRED* - use the private target api
					_positionableTargetChanged: function() {
						this._target = this.target;
					}
				});
			});
		</script>
	</dom-module>

	<div id="target"></div>

	<test-positionable id="testPanel" target="#target"></test-positionable>

	<script>
		
		describe("behavior_positionable", function() {

			it("should return document as _scope by default", function() {
				var a =