Mac browsers are much more Mac-like than Electron apps, because they use native Mac APIs for these interactions. For example, Command-Z in Chrome highlights the menu properly because it's handled via the Mac UI frameworks, not intercepted by JS.

The Ctrl+Cmd+D example works in Chrome and doesn't in an Electron-based IDE I happen to have open now; likewise the right-click menu on selected text works in the former and not the latter. I presume Chrome uses Blink to render UI components within Chrome windows, but in most other respects it behaves like a native macOS app.

WebKit generally behaves reasonably well on macOS (which makes sense, with WebKit being Apple’s baby). Blink/chrome on the other hand, while behaving better than Gecko has eschewed many Mac specific behaviors, presumably for ease of cross platform development.