HTML5 Constraint Rules (JSON)
A machine-readable reference for every HTML5 constraint attribute: which control types accept it, an example that validates, an example that does not, and the behaviour that surprises people. Paired with the constraint-matrix forms in this wave.
{
"schemaVersion": 1,
"generatedBy": "generation/forms_p7.py",
"note": "SAMPLE reference data. Values are fictional and no service validates against this file.",
"attributes": [
{
"attribute": "required",
"appliesTo": [
"text",
"email",
"tel",
"url",
"password",
"search",
"number",
"date",
"time",
"file",
"checkbox",
"radio",
"select",
"textarea"
],
"valid": [
"a non-empty value",
"any checked radio in the group"
],
"invalid": [
"an empty string",
"whitespace only in most browsers"
],
"notes": "On a radio group the flag applies to the group, not to a single control."
},
{
"attribute": "pattern",
"appliesTo": [
"text",
"search",
"url",
"tel",
"email",
"password"
],
"valid": [
"[0-9]{6}",
"NX-[0-9]{4}-[A-Z]{2}"
],
"invalid": [
"/[0-9]{6}/ with delimiters",
"an unanchored fragment relied on as anchored"Specifications
- Kind
- reference
- Attributes
- 12
- Schema Version
- 1
What is a .json file?
JSON (JavaScript Object Notation) is a lightweight, text-based data-interchange format representing objects, arrays, strings, numbers, booleans, and null. It is language-independent, human-readable, and the dominant format for web APIs and configuration. It requires a single well-formed root value.
How to use this file
Use an example JSON file to test parsers and serializers, schema validation, Unicode and number-precision handling, and API request or response processing.
How to use this file for testing
“HTML5 Constraint Rules (JSON)” is a deterministic Novus Examples fixture for Form parsing, Form testing, JSON parsing. PDF AcroForms with documented fields and live HTML forms for testing form parsers and fillers.
Documented properties for this file: JSON · 5,424 bytes. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
This form is fictional SAMPLE content for tooling tests (autofill, scrapers, PDF fillers). It is not an official government, bank, or clinic form. Open the HTML offline or fill the PDF in any viewer; the demo submit path never stores data.
Code examples
import json
with open("form-constraint-rules.json") as f:
data = json.load(f)
print(type(data), len(data))Related files
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Generated by generation/forms_p7.py. Free for any use, no attribution required — license.