Debug mode not working

Hello @mstep

Thank you for reaching out.
Can you please share the website URL?
What may cause the HTML snippet to not appear is the HTML minify. You can try disabling HTML minify in Peroformance>Minify, save all settings and purge the cache, and then check the page source.
Alternatively, you can try adding the word “Performance” in Performance>Minify>HTML&XML>Ignored comment stems: field, save all settings and purge the cache and hard reload your page.
Thanks!

Thanks, but i followed your suggestion but it made no difference.

But it is suddenly working now. It may have cause by using cloudflare through our host, which I turned on and off today. Does that seem reasonable?

Anyway, here is the output I got and I have question. It says no-cache, and I need to understand if the page is cached or not. How do I do that?

===============================================

Performance optimized by W3 Total Cache. Learn more: https://www.boldgrid.com/w3-total-cache/

Object Caching 101/157 objects using memcached

Object Cache debug info:
Caching:            enabled
Total calls:        157
Cache hits:         101
Total time:         0.0213
Page Caching using disk: enhanced 

Page cache debug info:
Engine:             disk: enhanced
Cache key:          staging4.test.site/_index_ssl.html
Creation Time:      1621529183.000s
Header info:
Set-Cookie:         PHPSESSID=74623cbb875bbab673e94d9c6d2bbca5; path=/
Expires:            Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control:      no-store, no-cache, must-revalidate
Pragma:             no-cache
Content-Type:       text/html; charset=UTF-8
Link:               <https://staging4.test.site/wp-json/>; rel="https://api.w.org/"
Link:               <https://staging4.test.site/wp-json/wp/v2/pages/570>; rel="alternate"; type="application/json"
Link:               <https://staging4.test.site/>; rel=shortlink

Lazy Loading

Served from: staging4.test.site @ 2021-05-20 16:46:23 by W3 Total Cache

Hello @mstep

Thank you for the info
Cache-Control: no-cache. Forces caches to submit the request to the origin server for validation before releasing a cached copy.
This is being handled by the Browser Cache settings in Performance>Browser Cache>HTML&XML where you can set the cache-control header.
As you can see the page is cached staging4.test.site/_index_ssl.html
Thanks!

Thank you.