Add back dom.md

Needed for the site index for now.

src/content/interop/js-interop/dom.md

@@ -0,0 +1,34 @@
+---
+title: How to interop with DOM APIs
+description: How to use package:web to communicate with the browser in Dart.
+---
+
+// *Introdcution paragraphs*
+
+## Background concepts
+
+The following sections provide some extra background and information
+around the technologies and concepts used in the tutorial.
+To skip directly to the tutorial content,
+go to [Steps](#steps).
+
+### Topic/concept 1
+
+### Topic/concept..n
+
+## Steps
+
+### Prerequisites
+
+Before you begin, you'll need...
+* 
+
+### Actionable step 1
+
+Step subsections should be actionalble, like "Build...", "Retrieve...", "Configure...", etc.
+
+### Actionable step...n
+
+## What next?
+
+Point to other tutorials, reference, etc.