Much like others, I'm using a CEF view that is hosted in a StackView inside an NSSPlitView. When doing this, its common for AutoLayout to set your view to a size that isn't whole numbers. Seems that when the frame's .height isn't whole, CEF internally scrolls the web content when it shouldn't.
My fix was to basically have a wrapper view with a single child (with no layout constraints or autoresizing mask). The child (targetView in my example) is what i hand to CEF to draw into and then do this in the wrapper view's layout:
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override func layout() {
super.layout()
self.targetView.frame = self.bounds.integral
}
The key being the .integral. This ensures the view CEF is interacting with never has fractional size and no longer scrolls into oblivion.
Hope this helps.