I have two questions about the spelling correction.
I have seen in edge (and all Chromium browsers) a flags to use the spell checker of windows 10 but i want to know.
On stable version, here what is actually and by default the spell checker used (Hunspell or the one integrated on windows 10) ?
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See here: Introducing an improved spellcheck experience in Microsoft Edge - Microsoft Edge Blog (windows.com)
According to this, if the language you're trying to check spelling in isn't available in Windows 10, Edge will fall back to Hunspell.