diff --git a/app.js b/app.js
index e69de29..52bfdba 100644
--- a/app.js
+++ b/app.js
@@ -0,0 +1,20 @@
+let startTime;
+let windowInterval;
+
+const displayTime = () => {
+ // console.log(Date.now()-startTime);
+ document.querySelector('h1').innerHTML = Math.floor((Date.now()-startTime)/1000);
+}
+
+document.querySelector('.btn-primary').addEventListener('click', (event) => {
+ startTime=Date.now();
+ windowInterval = window.setInterval(displayTime,1000)
+})
+
+document.querySelector('.btn-secondary').addEventListener('click', (event) => {
+ window.clearInterval(windowInterval)
+})
+
+window.onbeforeunload = function(){
+ return 'Good bye'
+}
diff --git a/index.html b/index.html
index 7c5c2b4..3c943bc 100644
--- a/index.html
+++ b/index.html
@@ -7,14 +7,14 @@
-
- Hello, world!
+ Practice Timer
- Hello, world!
+
+