Initial Observations: Seems that we need to see the source code of the web page.
Tools Used
Web Inspect
Solution Steps
**Inspecting the web page
There is a button that says Say hello that when clicked on an alert is displayed.
Inspecting the source code
By inspecting the sources tab we can see three files HTML, JS, CSS.
By viewing the contents of the JS and CSS files the flag first half is in the CSS file and the other half is in the JS file.