Definition
CSS Layout API Level 1 defines LayoutConstraints
[Exposed=LayoutWorklet]
interface LayoutConstraints {
readonly attribute double availableInlineSize;
readonly attribute double availableBlockSize;
readonly attribute double? fixedInlineSize;
readonly attribute double? fixedBlockSize;
readonly attribute double percentageInlineSize;
readonly attribute double percentageBlockSize;
readonly attribute double? blockFragmentationOffset;
readonly attribute BlockFragmentationType blockFragmentationType;
readonly attribute any data;
};