I have an interesting case to analyze, the web application I developed works great in mobile browsers: Firefox, Google Chrome, however when viewing the application in Safari on an iPhone, for some reason it takes too long. I have to go into Sherlock Holmes mode, debug and solve the case; I am surprised that Safari does not have the legendary F12. Maybe he's in ninja mode and has it hidden somewhere. Do they know how to display it or if you have to pay for an app from the AppStore to access it?
AOverflow.com
Elemental my dear Watson, in Safari, the classic inspect element is in ninja mode, you have to enable it as follows:
On the menu bar, click Safari > Preferences > Advanced tab.
Mark the check: "Show Develop menu in menu bar"
Now yes, on the page right click, inspect element.