Setting Calts OFF by default

Hello. I am making a font that relies in contextual alternates to provide a desired effect, but I wish the feature was off by default rather than imposed by the font. I saw in another post that the official UI Recommendation is that calt should be on by default. Is there a way to purposely override this? Otherwise, I will have to make the font in two separate versions. One with the contextual alternates and one without it.

Thanks in advance!

Whether a feature is on or off by default is controlled by the app that font is used in; the font has no influence.

Consider using a different feature that is generally off by default, like dlig.

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Thanks. Since I’m making a creative display font, dlig won’t work. I can just have two separate versions of the font, with effect and without it.

Why would dlig not work?