I know why black, because I use
webView?.translatesAutoresizingMaskIntoConstraints = false
to avoid some wkwebview bug in Xcode 13.x;
now this code make black screen bug, remove it, black screen disappeared.
but
new bug appeared:
after enter fullscreen again, the WebView become small size that same as main window.
headache~~
ByteChuan
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Maybe this is Why my bug: https://developer.apple.com/forums/thread/720612