diff --git a/src/lab/CommonExp.js b/src/lab/CommonExp.js
new file mode 100644
index 00000000..8767be13
--- /dev/null
+++ b/src/lab/CommonExp.js
@@ -0,0 +1,7 @@
+// Code to highlight the each selected tab.
+let list = document.querySelectorAll('.tabOption')
+console.log(list);
+list.forEach(li=>li.addEventListener('click',e=>{
+ list.forEach(item => item.style.backgroundColor="#eee");
+ e.target.style.backgroundColor="#ddd";
+}));
\ No newline at end of file
diff --git a/src/lab/exp1/index.html b/src/lab/exp1/index.html
index 0669719f..0a8e677b 100644
--- a/src/lab/exp1/index.html
+++ b/src/lab/exp1/index.html
@@ -56,11 +56,11 @@
@@ -142,5 +142,7 @@
+
+