# canvas.insertHtml
mutation write
Use when the requested change exactly matches canvas.insertHtml; read the current state first when a version or identifier may have changed.
## Before calling
- Authenticate as the accountable Enhance person.
- Use only resource identifiers returned by an earlier capability result or supplied by the person.
- Reuse clientToken only when retrying this exact mutation input.
## Input
Show complete JSON Schema
```json
{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"canvasRef":{"type":"string","minLength":1},"baseVersion":{"type":"integer","exclusiveMinimum":0,"maximum":9007199254740991},"destination":{"type":"object","properties":{"parentNodeId":{"type":"string","minLength":1,"description":"Existing editable container, or root for top-level insertion. Preserve page and selection scope."}},"required":["parentNodeId"],"additionalProperties":false},"html":{"type":"string","minLength":1,"description":"One populated, safe HTML/CSS visual group. Use authored positioning in the HTML for placement. The canonical compiler assigns fresh IDs."},"waitMs":{"default":1500,"description":"Additional polling after the initial server call; this does not bound initial compilation time.","type":"integer","minimum":0,"maximum":5000}},"required":["canvasRef","baseVersion","destination","html"],"additionalProperties":false}
```
### Example
Show example input
```json
{
"canvasRef": "00000000-0000-4000-8000-000000000010",
"baseVersion": 1,
"destination": {
"parentNodeId": "root"
},
"html": "Hello
",
"waitMs": 1500
}
```
## Result
Returns a typed canvas.insertHtml result from the Enhance API without transport-specific prose.
## Recovery
- BAD_REQUEST: correct the named fields and call again.
- UNAUTHORIZED: restore Enhance authentication, then retry once.
- FORBIDDEN or NOT_FOUND: check the supplied resource and selection; do not substitute unrelated content. Ask for corrected access or scope if needed.
- CONFLICT: read the current resource, merge the intended change, and retry with its version.
- INTERNAL: run Enhance diagnostics, report the failure, and stop repeating the call.
## Continue with
- Read the affected canvas resource to confirm the result.
Compatibility: `3b1c4d5d7f46f97399ed4f4f7a0f0cc8c2526d395e3796e138eef96ae54ba3f1`.