golang.org/x/net v0.61.0: atom.Html

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/atom.Html in pkg:golang/golang.org/x/net@v0.61.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.61.0
Demonstrate these symbols/APIs:
  - golang.org/x/net/html/atom.Html

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.

{"case":{"caseId":"case:sha256:ae7d28202e86e8bbc31e2daf8baf03753275c8f788dbd7226246ae015ecab598","contract":["atom.Html is a non-zero Atom constant representing the \"html\" HTML tag","atom.Html.String returns \"html\"","atom.Lookup with byte slice \"html\" returns atom.Html","atom.Lookup is case-sensitive and returns 0 for uppercase \"HTML\"","atom.String with byte slice \"html\" returns string \"html\"","atom.Html is distinct from other HTML tag atoms including atom.Head, atom.Body, and atom.Div"],"goal":"verify golang.org/x/net/html/atom.Html in pkg:golang/golang.org/x/net@v0.61.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.61.0"],"schemaVersion":1,"symbols":["golang.org/x/net/html/atom.Html"]},"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@v0.61.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.61.0","symbols":["golang.org/x/net/html/atom.Html"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/net v0.61.0 // indirect

golang.org/x/net v0.61.0 h1:RR+6j/BTBCrggOLugxa+66R8FvoN6MHlzDlZIbN9YFw=
golang.org/x/net v0.61.0/go.mod h1:WgDCOTH8iwtB66T4/GfI94AHo/hhdb7Hah9NDseQfiI=

package main

import (
	"fmt"

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

func main() {
	// atom.Html represents the HTML "html" element tag
	h := atom.Html
	fmt.Printf("Atom: %s (value: 0x%x)\n", h.String(), uint32(h))

	// Lookup returns the atom corresponding to the given byte slice
	lookedUp := atom.Lookup([]byte("html"))
	fmt.Printf("Lookup(\"html\") == atom.Html: %t\n", lookedUp == h)

	// String returns the canonical string name
	str := atom.String([]byte("html"))
	fmt.Printf("String(\"html\"): %s\n", str)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html/atom.Html in pkg:golang/golang.org/x/net@v0.61.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.61.0"
  ],
  "symbols": [
    "golang.org/x/net/html/atom.Html"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	if err := runContractTests(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract test failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All contract assertions passed.")
}

func runContractTests() error {
	// 1. atom.Html is a non-zero Atom constant representing the "html" HTML tag
	if atom.Html == 0 {
		return fmt.Errorf("expected atom.Html to be non-zero, got 0")
	}

	// 2. atom.Html.String returns "html"
	if atom.Html.String() != "html" {
		return fmt.Errorf("expected atom.Html.String() to equal %q, got %q", "html", atom.Html.String())
	}

	// 3. atom.Lookup with byte slice "html" returns atom.Html
	if got := atom.Lookup([]byte("html")); got != atom.Html {
		return fmt.Errorf("expected atom.Lookup([]byte(\"html\")) to equal atom.Html, got %v", got)
	}

	// 4. atom.Lookup is case-sensitive and returns 0 for uppercase "HTML"
	if got := atom.Lookup([]byte("HTML")); got != 0 {
		return fmt.Errorf("expected atom.Lookup([]byte(\"HTML\")) to return 0, got %v", got)
	}

	// 5. atom.String with byte slice "html" returns string "html"
	if got := atom.String([]byte("html")); got != "html" {
		return fmt.Errorf("expected atom.String([]byte(\"html\")) to equal %q, got %q", "html", got)
	}

	// 6. atom.Html is distinct from other HTML tag atoms including atom.Head, atom.Body, and atom.Div
	if atom.Html == atom.Head {
		return fmt.Errorf("expected atom.Html != atom.Head")
	}
	if atom.Html == atom.Body {
		return fmt.Errorf("expected atom.Html != atom.Body")
	}
	if atom.Html == atom.Div {
		return fmt.Errorf("expected atom.Html != atom.Div")
	}

	return nil
}