Intervention reports

Intervention reports indicate that a browser has decided to not do what the server asked it to do for security, performance or user annoyance reasons. The browser may for example block phone vibration unless the user has already interacted with the page somehow.

The Report-To response header:

Report-To: {"group":"default","max_age":1800,"endpoints":[{"url":""}],"include_subdomains":true}

Use an "intervened" feature

The mousewheel (in Chromium-based browsers) and touch (also in Firefox) event listeners that are registered on document level targets (e.g. window.document or window) will be treated as passive (it has something to do with custom scrolling) if not specified as otherwise and calling preventDefault() inside such listeners will be ignored

and then use your mousewheel or your finger to scroll

show the code

See Chrome's incomplete list of interventions (the above-mentioned phone vibrate intervention is not included in this list for some reason).

Related specs & documents