Fallback alignment
In CSS Box Alignment, a fallback alignment is specified in order to deal with cases where the requested alignment cannot be fulfilled. For example, if you specify justify-content: space-between there must be more than one alignment subject. If there is not, the fallback alignment is used. This is specified per alignment method, as detailed below.
- First baseline
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start - Last baseline
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safe end - Baseline
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start - Space-between
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flex-start(start) - Space-around
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center - Space-evenly
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center - Stretch
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flex-start(start)