Random HTML Attribute Quoting Corpus Generator

Description

Compose bounded benign start-tag source with caller text, delegated five-character entity escaping, feasible double/single/unquoted/Boolean attribute forms, and duplicate attributes; retain the lexical parser's raw character references and first-duplicate rule, not DOM-decoded values, sanitization, or HTML conformance certification.

A protocol fixture is local test data representing headers, messages, identifiers, or request decisions. Serialization and parsing can be checked without contacting a server, while authentication, delivery, and actual client behavior require separate tests.

When to use this tool

Use this generator to create reproducible html attribute quoting corpus 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 tagNames, attributeNames, values, styles, caseCount, attributesPerTag 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 and keep answer-bearing fields separate when presenting an exercise.

Entity-encode supplied attribute values, choose only compatible quote styles, and serialize allowed attributes on sampled start tags. Delegate lexical parsing and verify lowercase names, encoded values, and first-occurrence handling of duplicate names.^[1]

Delegated operations used for this result: attribute parser; html entities. Their calculation or parsing conventions apply to the corresponding result fields.^{[2, 3]}

Input field	Meaning and units	Accepted input
tagNames	Tag Names	Required. Array of Text; one of "div", "span", "input", "button", "a", "p".; minimum items 1; maximum items 6.
attributeNames	Attribute Names	Required. Array of Text; minimum UTF-16 length 1; maximum UTF-16 length 32.; minimum items 1; maximum items 16.
values	Values	Required. Array of Text; maximum UTF-16 length 64.; minimum items 1; maximum items 16.
styles	Styles	Required. Array of Text; one of "double", "single", "unquoted", "boolean".; minimum items 1; maximum items 4.
caseCount	Case Count	Required. Safe integer; minimum 1; maximum 32.
attributesPerTag	Attributes Per Tag	Required. Safe integer; minimum 0; maximum 8.
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[].tag	Tag	Required. Text; minimum UTF-16 length 3; maximum UTF-16 length 4096.
cases[].sourceAttributes	Source Attributes	Required. Array of Object; no unknown keys.; maximum items 8.
cases[].sourceAttributes[].name	Name	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 32.
cases[].sourceAttributes[].inputValue	Input Value	Required. Text; maximum UTF-16 length 64.
cases[].sourceAttributes[].encodedValue	Encoded Value	Required. Text; maximum UTF-16 length 384.
cases[].sourceAttributes[].style	Style	Required. Text; one of "double", "single", "unquoted", "boolean".
cases[].parsed	Parsed	Required. Object; no unknown keys.
cases[].parsed.name	Name	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 6.
cases[].parsed.attributes	Attributes	Required. Array of Object; no unknown keys.; maximum items 8.
cases[].parsed.attributes[].name	Name	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 32.
cases[].parsed.attributes[].value	Value	Required. Text; maximum UTF-16 length 384.
randomness	Replay metadata: source is seed or context; seed is the normalized 32-bit seed or null for a context source.	Required. Object; no unknown keys.
randomness.seed	Optional numeric 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.

json

{
  "input": {
    "tagNames": [
      "div",
      "input"
    ],
    "attributeNames": [
      "TITLE",
      "data-id"
    ],
    "values": [
      "A&B",
      "x\"y"
    ],
    "styles": [
      "double",
      "single",
      "unquoted"
    ],
    "caseCount": 2,
    "attributesPerTag": 2,
    "seed": 42
  },
  "output": {
    "cases": [
      {
        "tag": "<input TITLE=x&quot;y TITLE=\"x&quot;y\">",
        "sourceAttributes": [
          {
            "name": "TITLE",
            "inputValue": "x\"y",
            "encodedValue": "x&quot;y",
            "style": "unquoted"
          },
          {
            "name": "TITLE",
            "inputValue": "x\"y",
            "encodedValue": "x&quot;y",
            "style": "double"
          }
        ],
        "parsed": {
          "name": "input",
          "attributes": [
            {
              "name": "title",
              "value": "x&quot;y"
            }
          ]
        }
      },
      {
        "tag": "<input data-id=\"A&amp;B\" data-id=\"x&quot;y\">",
        "sourceAttributes": [
          {
            "name": "data-id",
            "inputValue": "A&B",
            "encodedValue": "A&amp;B",
            "style": "double"
          },
          {
            "name": "data-id",
            "inputValue": "x\"y",
            "encodedValue": "x&quot;y",
            "style": "double"
          }
        ],
        "parsed": {
          "name": "input",
          "attributes": [
            {
              "name": "data-id",
              "value": "A&amp;B"
            }
          ]
        }
      }
    ],
    "randomness": {
      "seed": 42,
      "source": "seed"
    }
  }
}

Limitations and assumptions

The lexical parser preserves entity spellings in values rather than decoding a browser DOM. Unquoted and bare styles have extra eligibility rules; this is parser evidence, not a general HTML sanitizer.
A replay requires the same complete input and implementation. Randomized construction does not guarantee uniform coverage of every feasible output; finite samples can repeat unless a distinct-selection rule is explicitly stated.
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

Tool behavior and example: Random HTML Attribute Quoting Corpus Generator — tool.io
Calculation or validation: html/attribute-parser — tool.io
Calculation or validation: encode/html-entities — tool.io

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