Detect if Side Panel is Open on Left/Right

[Jack Crane]

From a Chrome Extension, is there a way to detect if the Chrome Side Panel is open on the left or right?

[woxxom]

AFAICT, there's no reliable method in Chrome due to https://crbug.com/40281264.

When it's fixed, you'll compare window.screenX to (await chrome.windows.getCurrent()).left inside the side panel.

For now though you'll have to obtain window.screenX from a content script running in any tab of this window.

Another workaround is to use event.screenX in a listener for mouseover event that's triggered by the user, which is not guaranteed to occur at all.

You can suggest implementing a proper API and a notification event for the change in https://github.com/w3c/webextensions/issues/