Further updates to sveltejs#3128 that works using examples contained within sveltejs#4402

Author: campbeln

src/compiler/compile/render_dom/index.ts

@@ -20,7 +20,7 @@ export default function dom(
 	block.has_outro_method = true;
 
 	// prevent fragment being created twice (#1063)
-	if (options.customElement) block.chunks.create.push(b`this.c = @noop;`);
+	//neek if (options.customElement) block.chunks.create.push(b`this.c = @noop;`);
 
 	const body = [];
 
@@ -453,7 +453,7 @@ export default function dom(
 							@insert(options.target, this, options.anchor);
 						}
 
-						this.$$.slotted = {};
+						this.$$.slotted = options.slots || {};
 						${(props.length > 0 || uses_props) && b`
 						for (const key in options.props.$$slots) {
 							this.$$.slotted[key] = options.props.$$slots[key][0]();

src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts

@@ -400,11 +400,15 @@ export default class InlineComponentWrapper extends Wrapper {
 				);
 			}
 
+					/*if (component.compile_options.customElement) {
+						@insert(${parent_node || '#target'}, ${name}, ${parent_node ? 'null' : 'anchor'});
+					}
+					else {
+						@mount_component(${name}, ${parent_node || '#target'}, ${parent_node ? 'null' : 'anchor'});
+					}*/
 			block.chunks.mount.push(b`
 				if (component.compile_options.customElement) {
-					block.chunks.mount.push(
-						@insert(${parent_node || '#target'}, ${name}, ${parent_node ? 'null' : 'anchor'});
-					)
+					@insert(${parent_node || '#target'}, ${name}, ${parent_node ? 'null' : 'anchor'});
 				}
 				else if (${name}) {
 					@mount_component(${name}, ${parent_node || '#target'}, ${parent_node ? 'null' : 'anchor'});

src/runtime/internal/Component.ts

@@ -176,6 +176,7 @@ if (typeof HTMLElement === 'function') {
 				// @ts-ignore todo: improve typings
 				//this.appendChild(this.$$.slotted[key]);
 				this.$$.slotted[key].m(this, null);
+				//this.appendChild(this.$$.slotted[key].m(this, null));
 			}
 		}