yeh,i don't to add layer for the webviews,i want add button to the webview,top levels

Title then that tag makes this question confusing. I know of webview in Android but not so much for "mac" or Apple OS. But that title that mentions chromium blows up what would be my guess as there is no code from you to examine. OK, if this is an Apple OS app, I'm reading https://developer.apple.com/forums/thread/123729 which if this is for Apple OS means you'll have to share code to see if anyone can see your issue. That and a better explanation of your app and what it runs on.

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