Ten Safari Long-Press Shortcuts
Much of Safari’s advanced functionality is hidden behind ‘secret’ long-press gestures that you can’t really know about unless you try randomly … or someone tells you. We’ve rounded up all the Safari long press tips and tricks below, so you can take advantage of all the different shortcuts and features it offers.
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New to iOS 11, it is actually possible to have Safari automatically launch Reader for select domains. This means you can view a particular website without distractions, in the streamlined reading-focused Safari Reader interface, automatically every single time.
Update (2017-10-13): Rob Mathers:
Long pressing an image also displays the alt-text, if there is any.
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I also thought that it's "hidden", but really it's all in the iOS manual. All Safari buttons are mentioned together with their function on "hold"
https://help.apple.com/iphone/11/#/iph1fbef4daa
Nice list, thanks for the link. The only one i really knew about was long-press on an xkcd strip to get to the hidden "tooltip" :D