If you're using app-drawer with Polymer 2.0., it's necessary indicate the slot "drawer" to link app-drawer-layout element with lateral content. However, app-drawer-layout main content hasn't slot name.
<app-drawer-layout>
<app-drawer slot="drawer">
</app-drawer>`
MY CONTENT
</app-drawer-layout>
If you're using app-drawer with Polymer 2.0., it's necessary indicate the slot "drawer" to link app-drawer-layout element with lateral content. However, app-drawer-layout main content hasn't slot name.