golang.org/x/net v0.47.0: atom.Div

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.Div in pkg:golang/golang.org/x/net@v0.47.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/net@v0.47.0
Demonstrate these symbols/APIs:
  - golang.org/x/net/html/atom.Div

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:sha256:7e9b0aa8d34441a2402efb0f2f5988e3722f45e5df343dbe0c20970b23733b7f","contract":["atom.Div is a non-zero Atom constant representing the \"div\" HTML tag","atom.Div.String returns \"div\"","atom.Lookup with byte slice \"div\" returns atom.Div","atom.Lookup is case-sensitive and returns 0 for uppercase \"DIV\"","atom.String with byte slice \"div\" returns string \"div\"","atom.Div is distinct from other HTML tag atoms including atom.Span and atom.P"],"goal":"verify golang.org/x/net/html/atom.Div in pkg:golang/golang.org/x/net@v0.47.0","kind":"HOW","packages":["pkg:golang/golang.org/x/net@v0.47.0"],"schemaVersion":1,"symbols":["golang.org/x/net/html/atom.Div"]},"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@v0.47.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/net@v0.47.0","symbols":["golang.org/x/net/html/atom.Div"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/net v0.47.0

golang.org/x/net v0.47.0 h1:Mx+4dIFzqraBXUugkia1OOvlD6LemFo1ALMHjrXDOhY=
golang.org/x/net v0.47.0/go.mod h1:/jNxtkgq5yWUGYkaZGqo27cfGZ1c5Nen03aYrrKpVRU=

package main

import (
	"fmt"

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

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

	// Lookup returns the atom for the provided byte slice
	found := atom.Lookup([]byte("div"))
	fmt.Printf("Lookup(\"div\") == atom.Div: %t\n", found == d)

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

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/net/html/atom.Div in pkg:golang/golang.org/x/net@v0.47.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/net@v0.47.0"
  ],
  "symbols": [
    "golang.org/x/net/html/atom.Div"
  ]
}

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.Div is a non-zero Atom constant representing the "div" HTML tag
	if atom.Div == 0 {
		return fmt.Errorf("expected atom.Div to be non-zero, got 0")
	}

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

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

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

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

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

	return nil
}