Bing maps violation in Chrome (non-passive event listener to a scroll-blocking)

Question

I am getting these warnings in Chrome, it happens everywhere, even on every Bing samples page (https://samples.bingmapsportal.com/)

[Violation] Added non-passive event listener to a scroll-blocking <some> event. Consider marking event handler as 'passive' to make the page more responsive.
[Violation] Added non-passive event listener to a scroll-blocking 'touchstart' event. Consider marking event handler as 'passive' to make the page more responsive.

It makes any website having any map refresh slower and slower.

This is the url to fix it provided by Chrome: https://chromestatus.com/feature/5745543795965952

Answer 1

Hi straminmeztuzeft-3783

I have the following answer from you from the Maps Engineering Team:
The spec https://dom.spec.whatwg.org/#in-passive-listener-flag says "When set to true, options’s passive indicates that the callback will not cancel the event by invoking preventDefault()."

This means that when a user’s map element is larger than browser window, the desirable behavior is mouse/touch events in map area only affect map itself. Without preventDefault, it would zoom the map and scroll the container element as well, causing a broken experience.

The message is "By Design" and to avoid the message, ensure the map control is sized appropriately for your browser window.

Sincerely,
IoTGirl