diff --git a/demo/constructor-node.html b/demo/constructor-node.html
index c118772..06344aa 100644
--- a/demo/constructor-node.html
+++ b/demo/constructor-node.html
@@ -3,6 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <title>constructor-node</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
     <!-- 1. Define some markup -->
diff --git a/demo/constructor-nodelist.html b/demo/constructor-nodelist.html
index a784d2a..18ff44e 100644
--- a/demo/constructor-nodelist.html
+++ b/demo/constructor-nodelist.html
@@ -3,6 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <title>constructor-nodelist</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
     <!-- 1. Define some markup -->
diff --git a/demo/constructor-selector.html b/demo/constructor-selector.html
index 137116d..b06266c 100644
--- a/demo/constructor-selector.html
+++ b/demo/constructor-selector.html
@@ -3,6 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <title>constructor-selector</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
     <!-- 1. Define some markup -->
diff --git a/demo/function-target.html b/demo/function-target.html
index ee85c55..f055e8b 100644
--- a/demo/function-target.html
+++ b/demo/function-target.html
@@ -3,6 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <title>function-target</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
     <!-- 1. Define some markup -->
diff --git a/demo/function-text.html b/demo/function-text.html
index 55fefe5..5c19db3 100644
--- a/demo/function-text.html
+++ b/demo/function-text.html
@@ -3,6 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <title>function-text</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
     <!-- 1. Define some markup -->
diff --git a/demo/target-div.html b/demo/target-div.html
index 1e4af09..5796853 100644
--- a/demo/target-div.html
+++ b/demo/target-div.html
@@ -3,6 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <title>target-div</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
     <!-- 1. Define some markup -->
diff --git a/demo/target-input.html b/demo/target-input.html
index b24e8c5..ca5f17e 100644
--- a/demo/target-input.html
+++ b/demo/target-input.html
@@ -3,6 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <title>target-input</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
     <!-- 1. Define some markup -->
diff --git a/demo/target-textarea.html b/demo/target-textarea.html
index d8394f5..21cc7b0 100644
--- a/demo/target-textarea.html
+++ b/demo/target-textarea.html
@@ -3,6 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <title>target-textarea</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
     <!-- 1. Define some markup -->
