If you try opening https://pabio.com, “Rent jaw-dropping interior.” is the first H1 heading (control). I’m A/B testing a new heading “Furnish your apartment on a payment plan.” — but I don’t see it (do you?).

const growthbook = new GrowthBook({
  user: {
    id: "123"
  }
})

By default, experiments use the user's

id

property to assign variations. For logged out users, you probably want to use something else like an anonymous cookie id. In that case, you need to change the experiment "hashAttribute":

const growthbook = new GrowthBook({
  user: {
    cookieId: ...
  }
})
...

useExperiment({
  key: "my-test",
  variations: ["Control", "Variation"],
  hashAttribute: "cookieId"
})

The documentation for the react library isn't very clear right now. We'll fix that.

This would be an awesome out-of-the-box feature: Supporting the default anonymous ID cookie from Segment, Mixpanel, etc., the platforms you support 😄

The React docs suggest that tracking properties are

experiment

and

variation

, although it looks like the correct ones are

experimentId

and `variationId`: https://docs.growthbook.io/lib/react.