getWebWindow() not working for R2025B

[xiangruili]

It seems there are some changes in R2025. getWebWindow() gives following error:

Unrecognized field name "CEF".

Error in ([line 363])
hWin = struct(hController.PlatformHost).CEF;

I used to use:
cefWindowList = matlab.internal.webwindowmanager.instance.windowList;
but now it does not contain those instances for uifigure anymore.

[EricMagalhaesDelgado]

Mathworks is transitioning the figure controller from CEFFigurePlatformHost (that has CEF as property) to DivFigurePlatformHost (that doesn't have CEF).
.\MATLAB\R2025a\toolbox\matlab\uitools\uicomponents\components+matlab+ui+internal+controller+platformhost\CEFFigurePlatformHost.m
.\MATLAB\R2025a\toolbox\matlab\uitools\uicomponents\components+matlab+ui+internal+controller+platformhost\DivFigurePlatformHost.m

I used the openDevTools method of the CEF, which allowed debugging in the DOM’s world up to R2024b. Compiling the app as a web app just to access DevTools outside MATLAB does not make sense. :(

If you don’t need DevTools and are only using this library to customize the styling of UI components, you can replace the suggested approach. Instead of using the undocumented executeJS method, simply add an invisible uihtml component to your app and use it as a backdoor to the DOM. This achieves the same result more easily and without worrying about future compatibility issues.