html-test/06-forms-validation-ui.html at main · brianwestphal/html-test · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>06 — form validation UI</title>
<style>
  body { font-family: sans-serif; margin: 2em; }
  label { display: block; margin: 8px 0; }
  input:required { border-left: 4px solid #ea580c; padding-left: 6px; }
  input:optional { border-left: 4px solid #64748b; padding-left: 6px; }
  input:valid   { outline: 2px solid #16a34a; outline-offset: 2px; }
  input:invalid { outline: 2px solid #dc2626; outline-offset: 2px; }
  input:focus:invalid { background: #fee2e2; }
  .key { margin-top: 14px; font-size: 13px; color: #475569; }
</style>
</head>
<body>
<h1>Form validation pseudo-classes</h1>
<p class="key">Orange bar = required. Gray bar = optional. Outline green = valid. Outline red = invalid.</p>

<form>
  <label>Required text (empty = invalid)
    <input type="text" required value="">
  </label>
  <label>Required + filled
    <input type="text" required value="ok">
  </label>
  <label>Email pattern
    <input type="email" value="not-an-email">
  </label>
  <label>Email valid
    <input type="email" value="user@example.com">
  </label>
  <label>Number min=1 max=10 (out of range)
    <input type="number" min="1" max="10" value="42">
  </label>
  <label>Pattern [A-Z]{3}
    <input type="text" pattern="[A-Z]{3}" value="abc" required>
  </label>
  <label>Pattern match
    <input type="text" pattern="[A-Z]{3}" value="XYZ" required>
  </label>
  <label>Optional
    <input type="text" value="optional field">
  </label>
</form>
</body>
</html>