Over the years I've written a few stopwatch applications, as a simple way to learn a new technology or because my brother asked for it
To add this to your own page, you'll need the script, https://www.doogal.co.uk/js/stopwatch.js and jquery. Add references to the scripts and add a div with an ID of 'stopwatch' and you should be ready to go
Download the application
Download Delphi source