[css-layout-api] define or link to what "override size" means

[heycam]

https://drafts.css-houdini.org/css-layout-api/#translate-a-layoutconstraintsoptions-to-internal-constraints

The term "override size" in this algorithm isn't linked anywhere and is not explained. Is there a concept in CSS Sizing this should link to? Should this concept be called "fixed size" anyway, since that's the name of the IDL attribute it comes from?

[bfgeek]

Thanks - Good point. I'll define it - and rename it to fixed.

This is hinted at in the grid and flex algorithms when the flex/grid container calculates the inline/block size of a child. But doesn't specify how in turn - that child determines its size. Its also not mentioned in the sizing spec.

E.g. in flex box:
https://drafts.csswg.org/css-flexbox/#main-size
https://drafts.csswg.org/css-grid/#grid-item-sizing

From what I've seen all engines have this concept of an "fixed"/"override" size constraint on a child.