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I found this article which shows how to perform in the browser itself (in this case, Chrome), but does not work when Devtools is closed. Is there any way to do this directly in WAMP for localhost?
Edit 1: I also intend to perform some tests on mobile devices, where so far I have not found such a function as on the desktop.
You want dev tools to stay closed because it gets in the way of your screen or have some special reason?
– Fabri Damazio
First, why does Voce want a different solution than Dev Tools? Second, why test on your mobile device if you can simulate a device by Dev Tools itself? Third.... you can use a PHP Sleep() if you want to test a server data return delay. But I honestly think this Dev Tools solution is very suitable for everything you need.
– Karl Zillner