A tampermonkey script. When there is a search input box on the page, press the '/' key to quickly focus and scroll to the input box.
It's like pressing the '/' key on the Google search page and GitHub homepage.
https://greasyfork.org/zh-CN/scripts/436684-quicksearch
You can find a webpage with a search box, and press the'/' key to automatically focus and scroll to the search box.