Sample

golang.org/x/net v0.23.0: html.DocumentNode

Verified sample for golang golang.org/x/net v0.23.0: html.DocumentNode. The contract ran on go 1.26 · linux debian/x64 · docker and passed: html.Parse parses…

sha256:10fdbb6eda3632d6c5faef3da91e9d94dd5cffb28a0b5e2134d4e7041685c6fa

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 go 1.26 linux 24 · ubuntu · glibc 2.39 x64 go 1.26 go go 1

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@v0.23.0
Packages: golang.org/x/net v0.23.0
Symbols: golang.org/x/net/html.DocumentNode
Environment: go 1.26.6
Created: 2026-09-04T13:51:35Z

Contract

html.Parse parses an HTML document and returns a root Node with Type equal to html.DocumentNode
A DocumentNode has a nil Parent and contains the top-level DoctypeNode and ElementNode as children
html.Render successfully serializes a tree rooted at a DocumentNode back to an HTML string

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@v0.23.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.23.0
Demonstrate these symbols/APIs:
  - golang.org/x/net/html.DocumentNode
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

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:sha256:0b69254187e7cec8fa17696aa287c38c2aa6a65b0a1f8100da8ea854245df6a9","contract":["html.Parse parses an HTML document and returns a root Node with Type equal to html.DocumentNode","A DocumentNode has a nil Parent and contains the top-level DoctypeNode and ElementNode as children","html.Render successfully serializes a tree rooted at a DocumentNode back to an HTML string"],"goal":"verify golang.org/x/net/html.DocumentNode in pkg:golang/golang.org/x/net@v0.23.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.23.0"],"schemaVersion":1,"symbols":["golang.org/x/net/html.DocumentNode"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/net@v0.23.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.23.0","symbols":["golang.org/x/net/html.DocumentNode"],"verifierAdapter":"golang@1"}

go.mod

module example.com/sample

go 1.22.0

require golang.org/x/net v0.23.0

go.sum

golang.org/x/net v0.23.0 h1:7EYJ93RZ9vYSZAIb2x3lnuvqO5zneoD6IvWjuhfxjTs=
golang.org/x/net v0.23.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=

main.go

package main

import (
	"fmt"
	"log"
	"strings"

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

func main() {
	rawHTML := `<!DOCTYPE html><html><head><title>Sample</title></head><body><h1>CodeSampleX</h1></body></html>`

	doc, err := html.Parse(strings.NewReader(rawHTML))
	if err != nil {
		log.Fatalf("failed to parse HTML: %v", err)
	}

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

	for child := doc.FirstChild; child != nil; child = child.NextSibling {
		switch child.Type {
		case html.DoctypeNode:
			fmt.Printf("Found Doctype child: %s\n", child.Data)
		case html.ElementNode:
			fmt.Printf("Found Element child: <%s>\n", child.Data)
		}
	}
}

spec.json

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html.DocumentNode in pkg:golang/golang.org/x/net@v0.23.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.23.0"
  ],
  "symbols": [
    "golang.org/x/net/html.DocumentNode"
  ],
  "runtimeConditions": {
    "ecosystem": "golang",
    "language": "go",
    "packageManager": "go@1.26.6",
    "runtime": "go@1.26.6"
  }
}

test/contract.go

package main

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

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

func main() {
	// Assertion 1: html.Parse parses an HTML document and returns a root Node with Type equal to html.DocumentNode
	rawHTML := `<!DOCTYPE html><html><head><title>Test</title></head><body><p>Hello World</p></body></html>`
	doc, err := html.Parse(strings.NewReader(rawHTML))
	if err != nil {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: html.Parse returned error: %v\n", err)
		os.Exit(1)
	}
	if doc == nil {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: doc is nil\n")
		os.Exit(1)
	}
	if doc.Type != html.DocumentNode {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected Type %v (DocumentNode), got %v\n", html.DocumentNode, doc.Type)
		os.Exit(1)
	}
	if doc.Data != "" {
		fmt.Fprintf(os.Stderr, "assertion 1 failed: expected empty Data for DocumentNode, got %q\n", doc.Data)
		os.Exit(1)
	}

	// Assertion 2: A DocumentNode has a nil Parent and contains the top-level DoctypeNode and ElementNode as children
	if doc.Parent != nil {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected nil Parent for DocumentNode, got %v\n", doc.Parent)
		os.Exit(1)
	}

	doctypeChild := doc.FirstChild
	if doctypeChild == nil || doctypeChild.Type != html.DoctypeNode || doctypeChild.Data != "html" {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected first child to be DoctypeNode with Data 'html', got %+v\n", doctypeChild)
		os.Exit(1)
	}
	if doctypeChild.Parent != doc {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected doctype child Parent to point to DocumentNode\n")
		os.Exit(1)
	}

	htmlElemChild := doctypeChild.NextSibling
	if htmlElemChild == nil || htmlElemChild.Type != html.ElementNode || htmlElemChild.Data != "html" {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected second child to be ElementNode <html>, got %+v\n", htmlElemChild)
		os.Exit(1)
	}
	if htmlElemChild.Parent != doc {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected html elem child Parent to point to DocumentNode\n")
		os.Exit(1)
	}

	// Assertion 3: html.Render successfully serializes a tree rooted at a DocumentNode back to an HTML string
	var buf bytes.Buffer
	if err := html.Render(&buf, doc); err != nil {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: html.Render returned error: %v\n", err)
		os.Exit(1)
	}
	rendered := buf.String()
	expected := `<!DOCTYPE html><html><head><title>Test</title></head><body><p>Hello World</p></body></html>`
	if rendered != expected {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected rendered HTML %q, got %q\n", expected, rendered)
		os.Exit(1)
	}

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

Origin Seeder

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