diff --git a/src/snapshot.ts b/src/snapshot.ts
index 656de6ea..2d500d27 100644
--- a/src/snapshot.ts
+++ b/src/snapshot.ts
@@ -8,7 +8,7 @@ import {
 } from './types';
 
 let _id = 1;
-const symbolAndNumberRegex = RegExp('[^a-z]');
+const symbolAndNumberRegex = RegExp('[^a-z1-6]');
 
 function genId(): number {
   return _id++;
diff --git a/test/__snapshots__/integration.ts.snap b/test/__snapshots__/integration.ts.snap
index 715debc7..1e70a295 100644
--- a/test/__snapshots__/integration.ts.snap
+++ b/test/__snapshots__/integration.ts.snap
@@ -45,7 +45,8 @@ exports[`[html file]: basic.html 1`] = `
   <meta name=\\"viewport\\" content=\\"width=device-width, initial-scale=1.0\\" />
   <meta http-equiv=\\"X-UA-Compatible\\" content=\\"ie=edge\\" />
   <title>Document</title>
-</head><body></body></html>"
+</head><body>
+  <h1>Title</h1></body></html>"
 `;
 
 exports[`[html file]: block-element.html 1`] = `
@@ -184,8 +185,8 @@ exports[`[html file]: invalid-tagname.html 1`] = `
 <body>
   <div>Hello</div>
   <div>Hello</div>
-  <div>Hello</div>
-  <div></div></body></html>"
+  <div></div>
+</body></html>"
 `;
 
 exports[`[html file]: picture.html 1`] = `
@@ -222,7 +223,7 @@ exports[`[html file]: with-relative-res.html 1`] = `
 <body>
   <a href=\\"http://localhost:3030/basic.html\\"></a>
   <div>Hello</div>
-  <div>Hello</div>
+  <alt34>Hello</alt34>
   <div>Hello</div>
   <div></div>
   <img src=\\"http://localhost:3030/a.jpg\\" alt=\\"\\" srcset=\\"\\" />
diff --git a/test/html/basic.html b/test/html/basic.html
index 95fac2be..44d38cba 100644
--- a/test/html/basic.html
+++ b/test/html/basic.html
@@ -9,7 +9,7 @@
 </head>
 
 <body>
-
+  <h1>Title</h1>
 </body>
 
-</html>
\ No newline at end of file
+</html>
diff --git a/test/html/invalid-tagname.html b/test/html/invalid-tagname.html
index 4d9183df..e28dd710 100644
--- a/test/html/invalid-tagname.html
+++ b/test/html/invalid-tagname.html
@@ -8,8 +8,7 @@
 </head>
 <body>
   <alt="">Hello</alt="">
-  <alt34>Hello</alt34>
   <d123-_+!@#$%^&*()>Hello</d123-_+!@#$%^&*()>
   <ale#></ale#>
 </body>
-</html>
\ No newline at end of file
+</html>
