diff --git a/build/build.node.ts b/build/build.node.ts
index c9149709412..3a4a00be223 100644
--- a/build/build.node.ts
+++ b/build/build.node.ts
@@ -1008,10 +1008,11 @@ namespace $ {
 			const pack = $mol_file.absolute( path )
 			const source = pack.resolve( 'index.html' )
 			const target = pack.resolve( `-/test.html` )
+			const name = '$' + pack.relate( this.root() ).replaceAll( '/', '_' )
 
 			let content = source.exists()
 				? source.text()
-				: `<!doctype html><meta charset="utf-8" /><body><script src="web.js" charset="utf-8"></script>`
+				: `<!doctype html><meta charset="utf-8" /><body mol_view_root="${name}"><script src="web.js" charset="utf-8"></script>`
 			
 			content = content.replace(
 				/(<\/body>|$)/ , `
