Question

If I am using a cache manifest file like so

CACHE MANIFEST:
#version 1.0
products.html
scripts.js
styles.css

And then I make changes to scripts.js but DO NOT change products.html OR styles.css. I then update the commented version number, so now my manifest file looks like so

CACHE MANIFEST:
#version 1.1
products.html
scripts.js
styles.css

The question is: will all three files get downloaded? or only the scripts.js file that changed?

Answer 1

Well according to this website:

When updating an existing appcache, the browser sends standard
If-Modified-Since headers, so it skips re-downloading files that have
not changed.

However, I would really like a more authoritative source if possible before closing the question.