CodeSampleX

Sample

golang.org/x/net v0.24.0: html.DocumentNode

Verified sample for golang golang.org/x/net v0.24.0: html.DocumentNode. The contract ran on go 1.26 · linux debian/x64 · docker and passed: html.DocumentNode…

sha256:b845c2c184d6fe78b064a99daf71b81e8255174c1b848ea0871bcf6e682d3033

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 go

Verification-run environments

Environment Contract Stages Run
go 1.26 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · golang@1golang:1.26@sha256:e30143be198a…		 2026-09-04

Case

HOW
Goal
verify golang.org/x/net/html.DocumentNode in pkg:golang/golang.org/x/net@v0.24.0
Packages
Symbols
  • golang.org/x/net/html.DocumentNode
Created
2026-09-04T13:00:01Z

Contract

  1. html.DocumentNode is a distinct NodeType constant distinguishing document root nodes from element, text, and comment nodes
  2. html.Parse returns a root Node whose Type is html.DocumentNode with nil Parent and empty Data
  3. html.Parse produces DocumentNode whose top-level children point back to it as Parent
  4. html.DocumentNode can be constructed programmatically and populated with children using AppendChild
  5. html.Render serializes all top-level children of a DocumentNode into formatted HTML output
  6. Traversing Parent pointers from any descendant node terminates at the DocumentNode root
  7. html.DocumentNode supports child removal via RemoveChild updating FirstChild and LastChild

Files

  • PROMPT.md
  • csx.json
  • go.mod
  • go.sum
  • main.go
  • spec.json
  • test/contract.go

Download the source artifact (tar.gz)

Source

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify golang.org/x/net/html.DocumentNode in pkg:golang/golang.org/x/net@v0.24.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.24.0
Demonstrate these symbols/APIs:
  - golang.org/x/net/html.DocumentNode

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:3d8e9c66427d004c9fb9e3a30e8158109f88323716ff5d6891fe628d42aef0c7","contract":["html.DocumentNode is a distinct NodeType constant distinguishing document root nodes from element, text, and comment nodes","html.Parse returns a root Node whose Type is html.DocumentNode with nil Parent and empty Data","html.Parse produces DocumentNode whose top-level children point back to it as Parent","html.DocumentNode can be constructed programmatically and populated with children using AppendChild","html.Render serializes all top-level children of a DocumentNode into formatted HTML output","Traversing Parent pointers from any descendant node terminates at the DocumentNode root","html.DocumentNode supports child removal via RemoveChild updating FirstChild and LastChild"],"goal":"verify golang.org/x/net/html.DocumentNode in pkg:golang/golang.org/x/net@v0.24.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.24.0"],"schemaVersion":1,"symbols":["golang.org/x/net/html.DocumentNode"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/net@v0.24.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.24.0","symbols":["golang.org/x/net/html.DocumentNode"],"verifierAdapter":"golang@1"}
go.mod
module example.com/sample

go 1.25.0

require golang.org/x/net v0.24.0
go.sum
golang.org/x/net v0.24.0 h1:1PcaxkF854Fu3+lvBIx5SYn9wRlBzzcnHZSiaFFAb0w=
golang.org/x/net v0.24.0/go.mod h1:2Q7sJY5mzlzWjKtYUEXSlBWCdyaioyXzRB2RtU8KVE8=
main.go
package main

import (
	"bytes"
	"fmt"
	"strings"

	"golang.org/x/net/html"
	"golang.org/x/net/html/atom"
)

func main() {
	rawHTML := `<!DOCTYPE html><html><head><title>CodeSampleX</title></head><body><h1>Hello</h1></body></html>`
	doc, err := html.Parse(strings.NewReader(rawHTML))
	if err != nil {
		panic(err)
	}

	if doc.Type == html.DocumentNode {
		fmt.Println("Parsed document root is a DocumentNode")
	}

	for c := doc.FirstChild; c != nil; c = c.NextSibling {
		fmt.Printf("Top-level node type: %v, data: %q\n", c.Type, c.Data)
	}

	// Programmatic DocumentNode construction
	customDoc := &html.Node{
		Type: html.DocumentNode,
	}
	htmlElem := &html.Node{
		Type:     html.ElementNode,
		DataAtom: atom.Html,
		Data:     "html",
	}
	bodyElem := &html.Node{
		Type:     html.ElementNode,
		DataAtom: atom.Body,
		Data:     "body",
	}
	textElem := &html.Node{
		Type: html.TextNode,
		Data: "DocumentNode content",
	}
	bodyElem.AppendChild(textElem)
	htmlElem.AppendChild(bodyElem)
	customDoc.AppendChild(htmlElem)

	var buf bytes.Buffer
	if err := html.Render(&buf, customDoc); err != nil {
		panic(err)
	}
	fmt.Printf("Rendered document: %s\n", buf.String())
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html.DocumentNode in pkg:golang/golang.org/x/net@v0.24.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.24.0"
  ],
  "symbols": [
    "golang.org/x/net/html.DocumentNode"
  ]
}
test/contract.go
package main

import (
	"bytes"
	"fmt"
	"os"
	"strings"

	"golang.org/x/net/html"
	"golang.org/x/net/html/atom"
)

func main() {
	// 1. html.DocumentNode is a distinct NodeType constant distinguishing document root nodes from element, text, and comment nodes
	if html.DocumentNode == html.ElementNode {
		fmt.Fprintf(os.Stderr, "Contract 1 failed: DocumentNode must not equal ElementNode\n")
		os.Exit(1)
	}
	if html.DocumentNode == html.TextNode {
		fmt.Fprintf(os.Stderr, "Contract 1 failed: DocumentNode must not equal TextNode\n")
		os.Exit(1)
	}
	if html.DocumentNode == html.CommentNode {
		fmt.Fprintf(os.Stderr, "Contract 1 failed: DocumentNode must not equal CommentNode\n")
		os.Exit(1)
	}
	if html.DocumentNode == html.DoctypeNode {
		fmt.Fprintf(os.Stderr, "Contract 1 failed: DocumentNode must not equal DoctypeNode\n")
		os.Exit(1)
	}
	if html.DocumentNode == html.ErrorNode {
		fmt.Fprintf(os.Stderr, "Contract 1 failed: DocumentNode must not equal ErrorNode\n")
		os.Exit(1)
	}

	// 2. html.Parse returns a root Node whose Type is html.DocumentNode with nil Parent and empty Data
	rawHTML := `<!DOCTYPE html><html><head><title>Sample</title></head><body><p id="para">Text</p></body></html>`
	doc, err := html.Parse(strings.NewReader(rawHTML))
	if err != nil {
		fmt.Fprintf(os.Stderr, "Contract 2 failed: html.Parse error: %v\n", err)
		os.Exit(1)
	}
	if doc == nil {
		fmt.Fprintf(os.Stderr, "Contract 2 failed: doc is nil\n")
		os.Exit(1)
	}
	if doc.Type != html.DocumentNode {
		fmt.Fprintf(os.Stderr, "Contract 2 failed: doc.Type is %v, want DocumentNode\n", doc.Type)
		os.Exit(1)
	}
	if doc.Parent != nil {
		fmt.Fprintf(os.Stderr, "Contract 2 failed: doc.Parent is not nil\n")
		os.Exit(1)
	}
	if doc.Data != "" {
		fmt.Fprintf(os.Stderr, "Contract 2 failed: doc.Data is not empty: %q\n", doc.Data)
		os.Exit(1)
	}

	// 3. html.Parse produces DocumentNode whose top-level children point back to it as Parent
	if doc.FirstChild == nil {
		fmt.Fprintf(os.Stderr, "Contract 3 failed: doc has no children\n")
		os.Exit(1)
	}
	childCount := 0
	for c := doc.FirstChild; c != nil; c = c.NextSibling {
		childCount++
		if c.Parent != doc {
			fmt.Fprintf(os.Stderr, "Contract 3 failed: child %d parent is not doc\n", childCount)
			os.Exit(1)
		}
	}
	if childCount < 2 {
		fmt.Fprintf(os.Stderr, "Contract 3 failed: expected at least 2 top-level children, got %d\n", childCount)
		os.Exit(1)
	}

	// 4. html.DocumentNode can be constructed programmatically and populated with children using AppendChild
	customDoc := &html.Node{
		Type: html.DocumentNode,
	}
	div := &html.Node{
		Type:     html.ElementNode,
		DataAtom: atom.Div,
		Data:     "div",
	}
	span := &html.Node{
		Type:     html.ElementNode,
		DataAtom: atom.Span,
		Data:     "span",
	}
	customDoc.AppendChild(div)
	customDoc.AppendChild(span)
	if customDoc.FirstChild != div || customDoc.LastChild != span {
		fmt.Fprintf(os.Stderr, "Contract 4 failed: customDoc children pointers mismatch\n")
		os.Exit(1)
	}
	if div.Parent != customDoc || span.Parent != customDoc {
		fmt.Fprintf(os.Stderr, "Contract 4 failed: customDoc children Parent pointer mismatch\n")
		os.Exit(1)
	}
	if div.NextSibling != span || span.PrevSibling != div {
		fmt.Fprintf(os.Stderr, "Contract 4 failed: sibling pointers mismatch\n")
		os.Exit(1)
	}

	// 5. html.Render serializes all top-level children of a DocumentNode into formatted HTML output
	var renderBuf bytes.Buffer
	if err := html.Render(&renderBuf, customDoc); err != nil {
		fmt.Fprintf(os.Stderr, "Contract 5 failed: html.Render error: %v\n", err)
		os.Exit(1)
	}
	expectedRendered := "<div></div><span></span>"
	if renderBuf.String() != expectedRendered {
		fmt.Fprintf(os.Stderr, "Contract 5 failed: rendered HTML mismatch: got %q, want %q\n", renderBuf.String(), expectedRendered)
		os.Exit(1)
	}

	// 6. Traversing Parent pointers from any descendant node terminates at the DocumentNode root
	var paraNode *html.Node
	var findPara func(*html.Node)
	findPara = func(n *html.Node) {
		if n.Type == html.ElementNode && n.Data == "p" {
			paraNode = n
			return
		}
		for c := n.FirstChild; c != nil; c = c.NextSibling {
			findPara(c)
		}
	}
	findPara(doc)
	if paraNode == nil {
		fmt.Fprintf(os.Stderr, "Contract 6 failed: p node not found\n")
		os.Exit(1)
	}
	curr := paraNode
	for curr.Parent != nil {
		curr = curr.Parent
	}
	if curr != doc || curr.Type != html.DocumentNode {
		fmt.Fprintf(os.Stderr, "Contract 6 failed: traversal did not terminate at DocumentNode root\n")
		os.Exit(1)
	}

	// 7. html.DocumentNode supports child removal via RemoveChild updating FirstChild and LastChild
	customDoc.RemoveChild(span)
	if customDoc.FirstChild != div || customDoc.LastChild != div {
		fmt.Fprintf(os.Stderr, "Contract 7 failed: after RemoveChild FirstChild/LastChild mismatch\n")
		os.Exit(1)
	}
	if span.Parent != nil || span.PrevSibling != nil || span.NextSibling != nil {
		fmt.Fprintf(os.Stderr, "Contract 7 failed: removed span pointers not cleared\n")
		os.Exit(1)
	}

	fmt.Println("All contract assertions passed.")
}

Origin Seeder

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