Server-side program to monitor the given log file and capable of streaming updates that happen in it. This will run on the same machine as the log file.
Web-based client (accessible via URL http://localhost/log) that prints the updates in the file as and when they happen and NOT upon page refresh. The page loads once and it keeps getting updated in real-time.
The user sees the last 10 lines in the file when they visit on the page for the first time.