html7.7 KB
Required-Constraint Matrix (HTML)
A form that pairs each HTML control kind with a mandatory and an optional twin, so a validation harness can prove it detects the required attribute on text, email, number, date, select, textarea, radio group and consent checkbox alike.
Preview — first 44 lineshtml
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Required-constraint matrix - Novus Examples</title>
<meta name="description" content="Every control kind in its blank-allowed and must-be-filled variant. 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>Required-constraint matrix</h1>
<p class="lead">Every control kind in its blank-allowed and must-be-filled variant. 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>Controls that must be filled</legend>
<div class="field"><label for="f-text_required">Reference code <span class="req">*</span></label><input id="f-text_required" type="text" name="text_required" placeholder="NX-0001" required></div>
<div class="field"><label for="f-email_required">Email address <span class="req">*</span></label><input id="f-email_required" type="email" name="email_required" autocomplete="email" required></div>
<div class="field"><label for="f-number_required">Quantity <span class="req">*</span></label><input id="f-number_required" type="number" name="number_required" inputmode="numeric" min="1" max="99" step="1" required></div>
<div class="field"><label for="f-date_required">Effective date <span class="req">*</span></label><input id="f-date_required" type="date" name="date_required" min="2026-01-01" max="2026-12-31" required></div>
<div class="field"><label for="f-select_required">Region <span class="req">*</span></label><select id="f-select_required" name="select_required" required><option value="">Choose a region</option><option value="emea">EMEA</option><option value="amer">AMER</option><option value="apac">APAC</option></select></div>
<div class="field"><label for="f-textarea_required">Summary <span class="req">*</span></label><textarea id="f-textarea_required" name="textarea_required" minlength="10" rows="3" required></textarea><span class="hint">At least 10 characters.</span></div>
</fieldset>
<fieldset><legend>Contact preference <span class="req">*</span></legend>
<div class="group"><label class="opt" for="opt-contact-pref-email"><input id="opt-contact-pref-email" type="radio" name="contact_pref" value="email" required> By email</label><label class="opt" for="opt-contact-pref-phone"><input id="opt-contact-pref-phone" type="radio" name="contact_pref" value="phone" required> By phone</label><label class="opt" for="opt-contact-pref-none"><input id="opt-contact-pref-none" type="radio" name="contact_pref" value="none" required> Do not contact</label></div>
</fieldset>
<label class="opt" for="f-confirm_sample"><input id="f-confirm_sample" type="checkbox" name="confirm_sample" value="yes" required> I confirm this is SAMPLE test data only</label>
<fieldset><legend>Controls that may be left blank</legend>
<div class="field"><label for="f-text_optional">Internal note</label><input id="f-text_optional" type="text" name="text_optional" placeholder="Optional"></div>
<div class="field"><label for="f-tel_optional">Daytime phone</label><input id="f-tel_optional" type="tel" name="tel_optional" autocomplete="tel" inputmode="tel"></div>
</fieldset>
<fieldset><legend>Optional interests</legend>
<div class="group"><label class="opt" for="opt-optional-topics-release"><input id="opt-optional-topics-release" type="checkbox" name="optional_topics" value="release"> Release notes</label><label class="opt" for="opt-optional-topics-beta"><input id="opt-optional-topics-beta" type="checkbox" name="optional_topics" value="beta"> Beta programme</label><label class="opt" for="opt-optional-topics-events"><input id="opt-optional-topics-events" type="checkbox" name="optional_topics" value="events"> Events</label></div>
</fieldset>
<p class="hint" data-locked="notice">SAMPLE test data only - nothing is submitted, uploaded, or stored.</p>
<div class="ok" role="status">Every mandatory control was filled - nothing was sent.</div>
<div class="actions"><button type="submit" class="btn">Check the 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
- 11
- Use Case
- software-quality
- Validation
- HTML5 native
- Honeypot
- true
- Standalone
- true
- Dependencies
- none
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
“Required-Constraint Matrix (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: 11 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 required-constraint-matrix.html, host it on your site, then embed the form anywhere: -->
<iframe
src="/path/to/required-constraint-matrix.html"
title="Required-Constraint Matrix (HTML)"
width="100%"
height="640"
loading="lazy"
style="border:0">
</iframe>Related files
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