For example, TikTok can monitor all keyboard inputs and screen taps when you open a URL using the in-app browser. Meanwhile, Instagram can even detect all text selections on websites.

JavaScript has made it more complicated, in that it can add, remove or change different elements. Looking at the source code is not enough; you need to check the rendered HTML instead.

Run the JavaScript file upload example The files used in this example, along with a folder named upload, must be added to the htdocs folder of AHS. When a client accesses the uploader.html file ...