Khmer is an abugida script with complex stacking (subscripts) and ligatures. Supplemental fonts ensure these "clusters" render correctly without overlapping or missing parts. Why You Need Supplemental Fonts
Symbols used in specialized texts (like religious documents or historic inscriptions) that aren't in the base set. khmer supplemental fonts
This article explores what these supplemental fonts are, why they are essential for the Khmer script, and how to manage them on your device. What are Khmer Supplemental Fonts? Khmer is an abugida script with complex stacking