html6 KB
Duplicate Field Names (intentionally corrupt HTML)
Intentionally corrupt. Three pairs of unrelated controls share a name - two email inputs, two dates and a select that collides with a text input - so the submitted body carries the same key twice with different meanings. Use it to check that a parser reports the collision instead of silently keeping the last value.
Preview — first 38 lineshtml
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Duplicate field names - intentionally corrupt - Novus Examples</title>
<meta name="description" content="An intentionally corrupt form: three pairs of controls share one name each. SAMPLE test data only.">
<style>:root{--bg:#f6f7f9;--card:#fff;--fg:#1a1d23;--muted:#5b6472;--border:#d9dee6;--accent:#0f9d6b;--accent-d:#0c7f56;--err:#d33;--radius:10px}*{box-sizing:border-box}body{margin:0;font:16px/1.5 system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--fg);padding:2rem 1rem}.wrap{max-width:640px;margin:0 auto}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:1.75rem;box-shadow:0 1px 3px rgba(0,0,0,.05)}h1{margin:0 0 .25rem;font-size:1.55rem}.lead{margin:0 0 1.5rem;color:var(--muted)}form{display:grid;gap:1.1rem}.field{display:grid;gap:.35rem}label{font-weight:600;font-size:.92rem}.req{color:var(--err)}.hint{font-size:.8rem;color:var(--muted)}input,select,textarea{font:inherit;color:inherit;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:.6rem .7rem;width:100%}input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}textarea{resize:vertical;min-height:110px}input[type=range]{padding:0}input[type=color]{height:44px;padding:.25rem}input[type=file]{padding:.45rem}.group{display:grid;gap:.45rem}.opt{display:flex;align-items:center;gap:.55rem;font-weight:400}.opt input{width:auto}.inline{display:flex;flex-wrap:wrap;gap:1rem}fieldset{border:1px solid var(--border);border-radius:12px;padding:1rem;margin:0}legend{font-weight:600;padding:0 .4rem}.hp{position:absolute!important;left:-9999px;width:1px;height:1px;overflow:hidden}button{font:inherit;font-weight:700;cursor:pointer;border:0;border-radius:var(--radius);padding:.7rem 1.3rem}.btn{background:var(--accent);color:#fff}.btn:hover{background:var(--accent-d)}.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--border)}.actions{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.3rem}.ok{display:none;background:#e7f7ef;border:1px solid #b6e6cf;color:#0c7f56;border-radius:var(--radius);padding:.7rem .9rem;font-size:.9rem}.foot{margin-top:1.25rem;font-size:.78rem;color:var(--muted);text-align:center}@media(max-width:480px){body{padding:1rem .5rem}.card{padding:1.25rem}}.grid2{display:grid;gap:1.1rem;grid-template-columns:1fr}@media(min-width:560px){.grid2{grid-template-columns:1fr 1fr}}.note{font-size:.82rem;color:var(--muted);border-left:3px solid var(--border);padding:.15rem 0 .15rem .7rem;margin:.2rem 0}.steps{display:flex;gap:.4rem;flex-wrap:wrap;list-style:none;padding:0;margin:0 0 1.1rem;font-size:.8rem}.steps li{border:1px solid var(--border);border-radius:999px;padding:.2rem .7rem;color:var(--muted)}.steps li[aria-current=step]{border-color:var(--accent);color:var(--accent-d);font-weight:700}.vh{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}table.matrix{width:100%;border-collapse:collapse;font-size:.85rem}table.matrix th,table.matrix td{border:1px solid var(--border);padding:.4rem .5rem;text-align:left}table.matrix th{background:#eef1f5;font-weight:600}[data-branch]{display:none}[data-branch].on{display:grid}input:read-only,textarea:read-only{background:#f1f3f6;color:var(--muted)}input:disabled,select:disabled,textarea:disabled{background:#eceff3;color:#9aa3af}</style>
</head>
<body>
<main class="wrap"><div class="card">
<h1>Duplicate field names</h1>
<p class="lead">An intentionally corrupt form: three pairs of controls share one name each. SAMPLE test data only.</p>
<form method="post" action="#" novalidate>
<div class="hp" aria-hidden="true"><label>Leave this field empty<input type="text" name="website" tabindex="-1" autocomplete="off"></label></div>
<fieldset><legend>Two controls called email</legend>
<div class="field"><label for="f-email-primary">Primary email</label><input id="f-email-primary" type="email" name="email" value="first@example.com"></div>
<div class="field"><label for="f-email-secondary">Secondary email</label><input id="f-email-secondary" type="email" name="email" value="second@example.com"></div>
</fieldset>
<fieldset><legend>Two controls called start_date</legend>
<div class="field"><label for="f-start-contract">Contract start</label><input id="f-start-contract" type="date" name="start_date" value="2026-01-05"></div>
<div class="field"><label for="f-start-cover">Cover start</label><input id="f-start-cover" type="date" name="start_date" value="2026-03-30"></div>
</fieldset>
<fieldset><legend>A select and a text input called region</legend>
<div class="field"><label for="f-region-list">Region (list)</label><select id="f-region-list" name="region"><option value="emea" selected>EMEA</option><option value="amer">AMER</option></select></div>
<div class="field"><label for="f-region-text">Region (free text)</label><input id="f-region-text" type="text" name="region" value="APAC"></div>
</fieldset>
<p class="note">This file is intentionally corrupt. Every duplicated name is a defect, not a design - the valid way to repeat a key is the array notation shown in the repeated-array-field-names fixture.</p>
<p class="hint" data-locked="notice">SAMPLE test data only - nothing is submitted, uploaded, or stored.</p>
<div class="ok" role="status">The broken sample was parsed locally - nothing was sent.</div>
<div class="actions"><button type="submit" class="btn">Submit the broken sample</button></div>
</form>
<p class="foot">Free example form from Novus Examples · works offline, no data leaves your browser.</p>
</div></main>
<script>document.querySelectorAll('form').forEach(function(f){f.addEventListener('submit',function(e){e.preventDefault();var hp=f.querySelector('.hp input');if(hp&&hp.value){return;}if(!f.checkValidity()){f.reportValidity();return;}var ok=f.querySelector('.ok');if(ok){ok.style.display='block';ok.scrollIntoView({block:'nearest'});}f.reset();});});</script>
</body>
</html>
Specifications
- Fields
- 6
- Use Case
- software-quality
- Validation
- HTML5 native
- Honeypot
- true
- Standalone
- true
- Dependencies
- none
- Corrupt
- true
- Duplicated Names
- 3
- Defect
- same name on unrelated controls
What is a .html file?
HTML (HyperText Markup Language) is the structural markup language of the web, using nested tags to define document content, semantics, and links. It is typically paired with CSS for presentation and JavaScript for behavior. It is the foundational format rendered by browsers.
How to use this file
Use an example HTML file to test parsers, DOM construction, sanitization of untrusted markup, and rendering or scraping pipelines.
How to use this file for testing
“Duplicate Field Names (intentionally corrupt HTML)” is a deterministic Novus Examples fixture for Form testing, Form parsing, Autofill testing, HTML parsing. HTML and PDF form files for testing scrapers, autofill, validators, and PDF form fillers across real-life use cases.
Documented properties for this file: 6 fields. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
This form is fictional SAMPLE content for tooling tests (autofill, scrapers, PDF fillers). It is not an official government, bank, or clinic form. Open the HTML offline or fill the PDF in any viewer; the demo submit path never stores data.
Embed this form
It's a single self-contained HTML file (inlined CSS, native validation, no external requests). Download it, host it on your own site, and drop it into any page with an iframe.
iframe embed
<!-- Download broken-duplicate-field-names.html, host it on your site, then embed the form anywhere: -->
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