The <self-position> enumerated value data type is used by the justify-self and align-self properties, and the place-self shorthand, to align the box within its alignment container. It is also used by the justify-items and align-items properties, and the place-items shorthand, to specify default values for justify-self and align-self.
<self-position> = center | start | end | self-start | self-end | flex-start | flex-end
The following keyword values are represented by the <self-position> grammar term:
centerCenters the alignment subject within its alignment container.
startAligns the alignment subject flush with the alignment container's start edge.
endAligns the alignment subject flush with the alignment container's end edge.
self-startAligns the alignment subject flush with the edge of the alignment container corresponding to the alignment subject's start side.
self-endAligns the alignment subject flush with the edge of the alignment container corresponding to the alignment subject's end side.
flex-startIn flex layout, aligns the alignment subject flush with the edge of the alignment container corresponding to the flex container's main-start or cross-start side, as appropriate. It is identical to start for layout modes other than flex layout.
flex-endIn flex layout, aligns the alignment subject flush with the edge of the alignment container corresponding to the flex container's main-end or cross-end side, as appropriate. Identical to end for layout modes other than flex layout.
Note: The left and right keywords are excluded from <self-position>, despite being valid positional alignment values for the justify-* properties (justify-content, justify-self, and justify-items), because they are not allowed in the align-* properties (align-content, align-self, and align-items). They are instead explicitly included in the justify-* properties' grammars.
align-self, justify-self, place-self, align-items, justify-items, place-items
<baseline-position>, <content-distribution>, <overflow-position>, and <content-position>
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https://developer.mozilla.org/en-US/docs/Web/CSS/self-position