Render Failures
How to diagnose failures that appear after validation passes but rendering still fails.
Where to look when rendering fails after validation
If validation has already passed, the investigation shifts from contract shape to render behavior.
Reproduce the failure with the smallest possible valid input.
See whether unsafe markup or protocols are being blocked.
Confirm required external dependencies are allowed and reachable.
Look for fields that resolve to nothing or render in an unsupported way.
Correct the rendering condition instead of reopening a validation issue that already passed.
Render failures are rarely fixed by guessing harder at the schema.
Render failures happen after the inputs have validated but the output still cannot be produced.
That usually means the problem is in the rendering layer rather than the schema layer. Common causes include unsafe HTML, blocked external assets, unsupported URI schemes, or a template that assumes a field exists in a way the data does not support.
What To Inspect
- Whether sanitization is blocking unsafe markup
- Whether external assets are allowed in the current render options
- Whether the template is referencing a field that resolves to nothing
- Whether the output depends on an asset or fetch that is unavailable
Practical Fix Path
- Reproduce the failure with the smallest possible input.
- Check whether strict sanitization is stripping the content you expected to keep.
- Check whether
allowExternalAssetsorallowedSchemesis required for the output. - If the template is the issue, simplify the binding and try again.
When To Return To Standards
If the problem is caused by a contract rule rather than an implementation mistake, go back to the relevant standards page and confirm the intended behavior before changing the document.
