These are the Following Steps:-
Step-1. Push your volume buttons on the side of your phone like you normally would.
Step-2. Rather than continuing to push the physical button, just drag your finger on the volume indicator on your touchscreen, instead!.
Bonus Tip: The scroll bar in iOS 13 within the Safari app now lets you scroll faster, too. This especially comes in handy when you’re sifting through a lengthy PDF document.
Step-1. Scroll on a page as you normally would.
Step-2. Long-press on the scroll bar and drag it up or down.
Step-3. The faster you drag, the faster the page will scroll.