It doesn’t matter if you play sports, prepare food or wait for some important event, just use our countdown timer and you will not miss the right moment. With an accuracy of a second, a signal will sound notifying that the time has come. To implement start functionality in the countdown timer, first, we assign the selected DOM with the countdown HTML container to a variable. 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, and 60 minutes. Useful online timer to set alarm for hours, minutes and seconds. Non-paying users may create as many timers as they wish, but once an interval timer is started it may not be used again. Upgrading to the full version removes this restriction. Set this 30 Seconds timer and let the countdown start. Use it to control the time limit of any activity and be notified when that limit has been reached. When the countdown stops, you will receive a message on your browser warning you, and an alarm sound will ring. Once we have the HTML code in place, it is now time to add JS functionality by embedding the main.js file into the webpage. We will create a JavaScript variable to track the value of the current count in the timer. In order to add JavaScript functionalities to the app, we need to first add HTML elements allowing users to trigger the JS code on the webpage. Hence to support start, stop and reset functionality we are adding 3 buttons with images representing each action. Container in the index.html file to display the current countdown of the timer. In the below code, “countdown” is the parent container and the child container “countdown-number” encloses the timer count value with 30 as the default value.