<![CDATA[Window Management API not fully working on Opera GX]]>Hello,

I noticed that Opera GX already supports the window.getScreenDetails() API and correctly lists available displays and dimensions. However, when trying to open a new window on a specific screen using the left / top coordinates, the browser ignores those placement parameters.

So while sizing (width/height) works, positioning across monitors does not. This makes the API incomplete, since the main purpose of multi-screen management is to let apps choose which screen a window should appear on.

Could you clarify whether this is a known limitation in Opera GX’s implementation, or if there is a flag/permission needed to enable full screen placement (similar to Chrome’s window-management permission)?

Thank you.

]]>https://forums.opera.com/topic/86290/window-management-api-not-fully-working-on-opera-gxRSS for NodeSun, 12 Jul 2026 22:25:00 GMTWed, 17 Sep 2025 00:17:16 GMT60<![CDATA[Reply to Window Management API not fully working on Opera GX on Fri, 19 Sep 2025 09:30:33 GMT]]>Any difference in Opera GX 122.0.5643.52 based on Chromium 138 that just came out?

]]>https://forums.opera.com/post/392776https://forums.opera.com/post/392776Fri, 19 Sep 2025 09:30:33 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Fri, 19 Sep 2025 03:51:04 GMT]]>@andremartinsc I was just thinking it's a Chromium issue with Chromium 137. However, I tested in Chromium 137.0.7151.0, which is the closest compiled Win64 build I can find to 137.0.7151.122 that Opera GX uses. I also tested in Chromium 137.0.7152.0. Both of those builds work fine. No issues. So, it's less likely than I originally thought that it's just a Chromium issue. Still possible though.

Either way, those that need to know have been notified of your bug and this thread. Nothing more you can do at the moment.

]]>https://forums.opera.com/post/392757https://forums.opera.com/post/392757Fri, 19 Sep 2025 03:51:04 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Fri, 19 Sep 2025 01:24:15 GMT]]>@andremartinsc We don't know if it will be fixed in the next version, but they will fix the issue at some point.

Usually reporting the issue is enough

]]>https://forums.opera.com/post/392749https://forums.opera.com/post/392749Fri, 19 Sep 2025 01:24:15 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Fri, 19 Sep 2025 01:22:51 GMT]]>@andremartinsc So the bug ID is GX-11124

]]>https://forums.opera.com/post/392748https://forums.opera.com/post/392748Fri, 19 Sep 2025 01:22:51 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Thu, 18 Sep 2025 18:04:44 GMT]]>@burnout426 Found a JIRA link on the email I got.
https://opera.atlassian.net/servicedesk/customer/portal/118/GX-11124?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ0Z3QiOiJhbm9ueW1vdXMtbGluayIsInFzaCI6ImRlNDlhNjkwMTEwY2E2MWFmZTFlZGNiMDM0NDJlYTVkODc0MWVhYWY2ZjU4M2E0ODcxOGFiYTBlYzRlMmI5YjgiLCJpc3MiOiJzZXJ2aWNlZGVzay1qd3QtdG9rZW4taXNzdWVyIiwiY29udGV4dCI6eyJ1c2VyIjoiMzM0Mjg3IiwiaXNzdWUiOiJHWC0xMTEyNCJ9LCJleHAiOjE3NjA0ODY5NTEsImlhdCI6MTc1ODA2Nzc1MX0.JI9wD0rT9kRILrU6E2fjz3tWebLMptWm0tTgxGe4gG4

Are you 100% this is something they would fix on the next version? Is filing the bug enough or should I do anything else other than waiting?

]]>https://forums.opera.com/post/392727https://forums.opera.com/post/392727Thu, 18 Sep 2025 18:04:44 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Thu, 18 Sep 2025 09:39:34 GMT]]>@andremartinsc It usually shows the number after you file and I think you get an email too. Things could have changed though. No worries.

]]>https://forums.opera.com/post/392707https://forums.opera.com/post/392707Thu, 18 Sep 2025 09:39:34 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Wed, 17 Sep 2025 21:17:12 GMT]]>@burnout426 I am not sure where I can find that information. I just filled the form.

]]>https://forums.opera.com/post/392694https://forums.opera.com/post/392694Wed, 17 Sep 2025 21:17:12 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Wed, 17 Sep 2025 20:34:59 GMT]]>@andremartinsc I’m pretty sure it’s not intentional and I am going to guess it’ll be fixed automatically when GX moves to 138. So, we probably just have to wait. However, what’s the number for the bug you filed?

]]>https://forums.opera.com/post/392692https://forums.opera.com/post/392692Wed, 17 Sep 2025 20:34:59 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Wed, 17 Sep 2025 14:43:59 GMT]]>@burnout426 Thanks a lot for confirming and testing across both versions. Since it works fine in Opera One but not in GX, it does look like a GX-specific behavior (is this a bug or on purpose?).

I filed a bug report with the Opera GX team, but is there something else you’d recommend me doing?

]]>https://forums.opera.com/post/392661https://forums.opera.com/post/392661Wed, 17 Sep 2025 14:43:59 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Wed, 17 Sep 2025 05:25:22 GMT]]>@andremartinsc Okay. I can confirm the issue in Opera GX 121.0.5600.81 64-bit based on Chromium 137 on Windows 11 23H2. But, it works fine in Opera One 122.0.5643.24 64-bit based on Chromium 138.

Primary Screen: 1366 x 768
Secondary Screen: 1920 x 1080
Multi-monitor mode: Extend

In Opera GX, on screen 0, I hover the "Popup" button and choose screen 1. The window opens on screen 0 instead. In Opera One, it opens on screen 1.

In Opera GX, on screen 0, I set "left" to 1500, and click the "window" button and it opens on screen 0. In Opera One, it opens on screen 1 because 1500 is greater than the width of screen 0.

]]>https://forums.opera.com/post/392632https://forums.opera.com/post/392632Wed, 17 Sep 2025 05:25:22 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Wed, 17 Sep 2025 03:00:19 GMT]]>@burnout426 The MDN demo (see below) is enough to reproduce the problem. If you try to open a popup on a secondary screen, Opera doesn’t respect the left/top coordinates — the window always ends up on the primary display. The dimensions (width/height) are applied correctly, so it looks like the API is partially implemented, but the multi-screen placement part just isn’t supported in Opera right now.

https://michaelwasserman.github.io/window-placement-demo

]]>https://forums.opera.com/post/392630https://forums.opera.com/post/392630Wed, 17 Sep 2025 03:00:19 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Wed, 17 Sep 2025 02:54:56 GMT]]>@andremartinsc said in Window Management API not fully working on Opera GX:

However, when trying to open a new window on a specific screen using the left / top coordinates, the browser ignores those placement parameters.

Do you have a test case?

]]>https://forums.opera.com/post/392627https://forums.opera.com/post/392627Wed, 17 Sep 2025 02:54:56 GMT<![CDATA[Reply to Window Management API not fully working on Opera GX on Wed, 17 Sep 2025 02:49:57 GMT]]>@andremartinsc said in Window Management API not fully working on Opera GX:

Chrome’s window-management permission

Opera has that too at the URL opera://settings/content/windowManagement.

]]>https://forums.opera.com/post/392626https://forums.opera.com/post/392626Wed, 17 Sep 2025 02:49:57 GMT