Cache management through ETAGs in bfcache documentation

### MDN URL

https://developer.mozilla.org/en-US/docs/Glossary/bfcache

### What specific section or headline is this issue about?

_No response_

### What information was incorrect, unhelpful, or incomplete?

The article is a very brief introduction explanation of bfcache, but it doesn't fully explain the consequences for people who were managing their content with only HTTP caching (for example: ETags).

It would be great to create a deeper explanation of bfcache mechanisms in browsers and to relate it on different techniques available for webdevs who want to stick to more traditional mechanisms with HTTP caching, on how to escape bfcache for certain pages.

### What did you expect to see?

See above.

### Do you have any supporting links, references, or citations?

_No response_

### Do you have anything more you want to share?

_No response_

### MDN metadata

Page report details

* Folder: `en-us/glossary/bfcache`
* MDN URL: https://developer.mozilla.org/en-US/docs/Glossary/bfcache
* GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/glossary/bfcache/index.md
* Last commit: https://github.com/mdn/content/commit/2547f622337d6cbf8c3794776b17ed377d6aad57
* Document last modified: 2025-07-11T14:45:59.000Z