https://drafts.csswg.org/css-align/#justify-abspos, https://drafts.csswg.org/css-align/#align-abspos
For all other absolutely-positioned boxes, normal behaves as stretch.
That's not the case in Blink, normal behaves as start for abspos tables, and that makes sense to me.
<!DOCTYPE html>
<style>
div { display: inline-block; position: relative; border: solid; width: 100px; height: 100px; }
table { position: absolute; inset: 0; background: cyan; }
</style>
<div><table style="place-self: normal"><td>table</td></table></div>
<div><table style="place-self: stretch"><td>table</td></table></div>
There are tests for Blink's behavior:
<!DOCTYPE html>
<style>
div { display: inline-flex; border: solid; width: 100px; height: 100px; }
table { background: cyan; }
</style>
<div><table style="align-self: normal"><td>table</td></table></div>
<div><table style="align-self: stretch"><td>table</td></table></div>
Blink also uses 
justify-self: normal to explain the table shrink-to-fit size in block layout
<!DOCTYPE html>
<style>
div { display: inline-block; border: solid; width: 100px; height: 100px; }
table { background: cyan; }
</style>
<div><table style="justify-self: normal"><td>table</td></table></div>
<div><table style="justify-self: stretch"><td>table</td></table></div>
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