Cache browser 
Author: Vladimír B.
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How to ensure that your browser loads the following updates?
Posted on the
If you have only days after changing then that change can be reloaded by the use of ctrl-F5
Orther wise your browser will make that decision for you. There is no option in x5 for that cause it's a browser issue.
Author
As defined browser does LAST-MODIFIED, then know that the load that the code has been changed.