In CSS Flexbox, why are there no justify-items and justify-self

Consider the main axis and cross axis of a flex container: Source: W3C To align flex items along the main axis there is one property: justify-content To align flex items along the cross axis the

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How to Center Anything in CSS Using Flexbox and Grid ✨

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A Complete Guide to Flexbox

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justify content tutorial in tailwind css with justify items or justify self