Devicon silent rendering limits for undefined icon classes

Devicon renders icons through CSS font classes such as devicon-[name]-plain, devicon-[name]-wordmark, or devicon-[name]-line. When a class does not match a defined glyph, the element is expected to show no icon and no fallback character.

The documented rendering model relies on the devicon font-family being applied to the element. There is no official API or documented warning mechanism for detecting a missing or misspelled class, which creates uncertainty for deployment validation where iconography failures are silent.

For teams relying on visual consistency and log-based deployment checks, the lack of explicit error reporting is a key behavior limit to understand.

Is there a documented fallback or warning behavior for undefined devicon classes? Is programmatic detection of missing glyphs supported without visual inspection? What is the specified rendering outcome for elements with the devicon font-family but no matching glyph?