Changes do not appear.
WHAT IT USUALLY IS
Caching, at one of several levels.
WHERE CACHING HAPPENS
Your browser A caching plugin Server-level caching
A CDN
DNS, for address changes
WHAT TO DO IN ORDER
Load the page in a private window Clear your caching plugin Purge the CDN, if you use one Clear browser cache fully
IF IT IS RIGHT IN A PRIVATE WINDOW
Your browser cache. Clear it.
IF IT IS WRONG EVERYWHERE
A plugin or server cache. Purge it.
FOR A CDN
Purging can take a few minutes to take effect.
FOR CSS AND JAVASCRIPT CHANGES
Frequently cached most aggressively.
Some caching plugins offer versioning to force a refresh.
IF NOTHING CLEARS IT
Confirm you edited the file you think you did.
Check the document root and the active theme.
THAT LAST POINT
Editing a theme that is not active is a common and confusing error.
