Font formats
OpenType lookup-flag skip trace
Explain glyph skip decisions from extracted lookup flags and GDEF context.
Your inputs
Start with an exampleYour result
Example resultHow it works
Exempt the current glyph from skip flags. For other positions, apply class ignores, then mark-set membership or attachment-class filtering in the specified precedence. Keep missing context and invalid references explicit.
Flags 0x000A ignore bases and marks. The current base glyph remains exempt, the later mark skips, and the ligature, component and class-zero glyph remain.
Limits
Extracted logical tables only: 20000 positions, 256 mark sets, bounded class maps/JSON and an 8 MiB trace. A present ClassDef map is complete, so omitted IDs mean class zero; null means unavailable. Structural diagnostics remain even when another flag supersedes a filter. No binary font, Unicode guessing, lookup matching, substitution, positioning, nested flags or font-conformance verdict. RIGHT_TO_LEFT does not determine text direction.