1805110 - Sometimes randomly, devicemotion events are not fired until first click

Status: UNCONFIRMED

(Core :: DOM: Device Interfaces, defect, P3)

Description

[php4funs]

Firefox for Android

Steps to reproduce:

window.addEventListener('devicemotion', function(e) {
console.log("devicemotion event");
});

Actual results:

Sometimes, events don't start getting fired until you touch the screen.
Then, if you reload the page, they will start getting fired immediately.

I reproduced this consistently a few times. I would load a different page, then go to the test page, and events wouldn't fire until I would click, and then they would fire immediately on reload.

But then, I started getting random results. I visited a different unrelated page on another domain and it started firing events immediately. I went back to my test page and it did the same.

Expected results:

Should either start firing events immediately (or never, if the hardware doesn't support them), or require asking for permissions in a standard way.

If any attempt to only start firing events after a user interaction is by design, it is a wrong design that makes no sense and obeys no standard, and it also doesn't work consistently as it's utterly random.

Tested on Android

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::DOM: Events' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:cmartin, could you have a look please?

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