The Popup window Page didn't loaded #5108

Is there an existing issue for this?

• I have searched both open/closed issues, no issue already exists.

CefSharp Version

135.0.220.0

Operating System

Windows 11

Architecture

AnyCPU

.Net Version

.NET 4.8

Implementation

WPF

Reproduction Steps

Load a webpage that includes a window.open() call or .

Observe that:

The popup may not appear at all.

If it appears, it may render blank or crash.

DevTools or modal dialogs may behave inconsistently.

Expected behavior

Popup windows should open in a new ChromiumWebBrowser instance or new WPF window.
The content should render as expected.

Actual behavior

Popup windows are either:

Not opening at all.

Appearing with no content.

Causing UI freezes or crashes.

Regression?

No response

Known Workarounds

No response

Does this problem also occur in the CEF Sample Application

Yes using WPF/OffScreen command line args

Other information

No response