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We can improve Tabby using the Array spread operator. (This is a minor & optional change).
// Change this
const tabs = Array.from(tabby.querySelectorAll('.tab'))
const tabContents = Array.from(tabby.querySelectorAll('.tab-content'))
// To this
const tabs = [...tabby.querySelectorAll('.tab')]
const tabContents = [...tabby.querySelectorAll('.tab-content')]