who was creating a presentation in Khmer. She noticed that some of her text looked like small, empty boxes—what developers call "tofu"—instead of the beautiful, intricate characters of her native language.

For further technical details, you can visit the Microsoft Typography documentation or troubleshoot missing fonts on the Microsoft Support page. Font List Windows 10 - Typography - Microsoft Learn

Khmer supplemental fonts are specifically designed to address the typographical challenges of the Khmer language in digital environments. These fonts provide additional characters, glyphs, and typographical features that are not available in standard Khmer fonts. By using Khmer supplemental fonts, digital content creators can ensure that their text is displayed accurately and beautifully on various devices and platforms.

Navigate to Optional Features: Go to System > Optional features (or Apps > Optional features on some versions).