[2] Language enablement index, 8/21/2020, 4:05:14 PM, 10/18/2020, 7:04:53 AM https://w3c.github.io/typography/
[4] International text layout and typography index (2/9/2017, 7:20:37 AM) https://www.w3.org/TR/2017/WD-typography-20170209/
Google search: Layout Requirements