At https://hammerjs.github.io/api
click on any of the first few links in the list at the top of the page (under "General API").
They are broken deep links that are supposed to link to #anchors in the page which don't exist.
For example:
https://hammerjs.github.io/api/#hammer-defaults
https://hammerjs.github.io/api/#hammer-manager
None of these scrolls to the corresponding section of the page.