Description
Construct supplied form-group content with first, missing, last or duplicate legends, preserving a caller semantic answer key and the structural core's optional-legend distinction.
An interface fixture makes content and state explicit so a consumer can test a rendering or interaction. Literal labels, modeled states, and calculated geometry remain separate from what a browser or assistive technology actually displays or announces.
Construct supplied form-group content with first, missing, last or duplicate legends, preserving a caller semantic answer key and the structural core's optional-legend distinction.
When to use this tool
Use this generator to create reproducible fieldset legend structure fixture cases from the supplied model or bank. Inspect the returned evidence before using cases in a test or exercise.
How to use the tool and how it works
- Supply legend, fieldLabels, semanticKey, modes, count in the field shapes below. Set seed when you need an explicit replay.
- Run the tool and correct any input error. For generated controls, distinguish a successful fixture containing an invalid case from failure to generate the fixture.
- Read cases. Use the conventions below. Keep answer-bearing fields separate when presenting an exercise.
Create fieldset children with a legend first, last, duplicated, or absent according to the sampled mode. Delegate the immediate-child legend structure check and return child names, semanticKey, and escaped fixture markup.1
Delegated operations used for this result: fieldset legend a11y pair checker. Their calculation or parsing conventions apply to the corresponding result fields.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| legend | Legend | Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 128. |
| fieldLabels | Field Labels | Required. Array of Text; minimum UTF-16 length 1; maximum UTF-16 length 128.; minimum items 1; maximum items 16. |
| semanticKey | Semantic Key | Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 128. |
| modes | Modes | Required. Array of Text; one of "first", "missing", "last", "duplicate".; minimum items 1; maximum items 4. |
| count | Count | Required. Safe integer; minimum 1; maximum 32. |
| seed | Optional numeric seed; takes precedence over context randomness. Without either, use the fixed tool.io default seed. | Optional. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| cases | Cases | Required. Array of Object; no unknown keys.; minimum items 1; maximum items 32. |
| cases[].mode | Mode | Required. Text; one of "first", "missing", "last", "duplicate". |
| cases[].semanticKey | Semantic Key | Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 128. |
| cases[].children | Children | Required. Array of Text; maximum UTF-16 length 256.; minimum items 1; maximum items 18. |
| cases[].html | Html | Required. Text; maximum UTF-16 length 131072. |
| cases[].structure | Structure | Required. Object; no unknown keys. |
| cases[].structure.legendCount | Legend Count | Required. Safe integer; minimum 0; maximum 9007199254740991. |
| cases[].structure.legendFirst | Legend First | Required. Boolean. |
| cases[].structure.validPlacement | Valid Placement | Required. Boolean. |
| cases[].structure.hasLegend | Has Legend | Required. Boolean. |
| randomness | Replay source and normalized 32-bit seed, or null seed for an advancing context source. | Required. Object; no unknown keys. |
| randomness.seed | Optional safe-integer replay seed; normalization and precedence are explained below. | Required. Safe integer. or Null. |
| randomness.source | Source | Required. Text; one of "context", "seed". |
An explicit safe-integer seed takes precedence over injected context randomness and is normalized to an unsigned 32-bit integer. With no seed and no context source, replay uses the fixed tool.io default seed. A context source must return finite values from zero inclusive to one exclusive; its advancing state must be retained separately. randomness records the source and normalized seed, or null for context. These generators are not cryptographic random sources.
{
"input": {
"legend": "Contact",
"fieldLabels": [
"Email"
],
"semanticKey": "contact-group",
"modes": [
"first",
"missing",
"last",
"duplicate"
],
"count": 1,
"seed": 42
},
"output": {
"cases": [
{
"mode": "last",
"semanticKey": "contact-group",
"children": [
"input",
"legend"
],
"html": "<fieldset><input aria-label=\"Email\"><legend>Contact</legend></fieldset>",
"structure": {
"legendCount": 1,
"legendFirst": false,
"validPlacement": false,
"hasLegend": true
}
}
],
"randomness": {
"seed": 42,
"source": "seed"
}
}
}Limitations and assumptions
- The structure checker does not assess whether legend text communicates the intended group meaning. semanticKey is supplied metadata, and generated markup is not a complete form-accessibility audit.
- A replay requires the same complete input and implementation. The stated sampling convention applies within its eligible space. A finite draw does not exhaust all possible outputs; repeats remain possible unless a distinct-selection rule is explicit.
- The field tables state structural bounds; cross-field constraints and bounded search or output budgets also apply. Unknown keys are rejected where the object contract disallows them. Input errors are distinct from null fields and deliberate invalid controls in a successful output.
Alternative or Complementary methods
For a supplied example, inspect the returned construction or delegated check directly. To evaluate a consumer, also test cases chosen for its own boundaries; a generated finite corpus does not establish exhaustive coverage.
References
Similar or alternative tools
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