"The position-try-fallbacks property allows us to define multiple positions. Let's try the following: Let's not forget that the placement is related to the containing block, which is the body in our example (illustrated with the dashed border): We almost have the same behavior as the first example; however if you are close to the right or left edges, you get the new positions. Instead of overflowing, the browser will swap to the right or left position."
"Similar to the first example, the gap disappears when switching to the fallback positions. We know how to fix it! Instead of explicitly defining the positions, we can rely on the "flip" feature. To move from top to bottom, we use flip-block: From top to left, we use flip-start: The flip-block value mirrors the position across the horizontal axis, and flip-start does the same across the diagonal. With this value, we can move from top to left and from bottom to right."
CSS position-try-fallbacks enables defining multiple placement options so the browser can swap to fallbacks when an element nears container edges. Placement is calculated relative to the containing block, often the body, which determines when alternate positions are used. Switching to fallback positions can remove the configured gap; using flip values restores consistent spacing. flip-block mirrors placement across the horizontal axis to move top↔bottom. flip-start mirrors across the diagonal to move top↔left and bottom↔right. flip-inline mirrors across the vertical axis to move left↔right. Combining flip values enables transitions between all four positions while maintaining relative centering.
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