Anyone who has tried to read a Khmer website on an older computer or an Android device without proper font support is familiar with the box-like characters (□□□) or random symbols that appear instead of text. This is often called "Mojibake."
This is the standard style for books and news. Supplemental fonts in this category focus on "eye fatigue" reduction. Designers look for fonts with distinct "feet" (sub-scripts) that don’t overlap with the line below. 3. Modern and Decorative Styles khmer supplemental fonts
Google’s Noto project (short for "No Tofu") is the king of supplemental fonts. The Khmer variant contains —significantly more than the 200-300 found in basic fonts. Anyone who has tried to read a Khmer
Without these supplemental glyphs, a document may display empty boxes (tofu), incorrect stacking, or substitute a completely wrong character. Designers look for fonts with distinct "feet" (sub-scripts)