[css-anchor] Anchor sizes and box sizing

[Crissov]

<anchor-size> = width | height | block | inline | self-block | self-inline

Do these dimensions respect the value of the box-sizing property or do they always use the border box of the target anchor element?

[tabatkins]

Edit: Nope, not underspecifed, it's always the border box.

An anchor-size() function representing a valid anchor query resolves to the separating the relevant border edges (either left and right, or top and bottom, whichever is in the specified axis) of the target anchor element.