HTML редактор

<!doctype html>
<html lang="ru">

<head>
  
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Капча на PHP</title>
  <style>
    *,
    *::before,
    *::after {
      box-sizing: border-box;
    }

body {
      margin: 0;
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
      font-size: 1rem;
      font-weight: 400;
      line-height: 1.5;
      color: #212529;
      text-align: left;
      background-color: #fff;
      -webkit-text-size-adjust: 100%;
      -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
    }

button {
      display: inline-flex;
      align-items: center;
      font-weight: 400;
      line-height: 1.5;
      color: #000;
      text-decoration: none;
      cursor: pointer;
      user-select: none;
      background-color: #f5f5f5;
      border: 1px solid #f5f5f5;
      padding: .375rem .75rem;
      font-size: 1rem;
      border-radius: .25rem;
      transition: background-color .15s ease-in-out, border-color .15s ease-in-out;
    }

button:hover {
      color: #000;
      background-color: #eee;
      border-color: #eee;
    }

button:focus {
      color: #000;
      background-color: #eee;
      border-color: #eee;
      box-shadow: 0 0 0 0.25rem rgba(158, 158, 158, 0.5);
    }

button:disabled {
      pointer-events: none;
      opacity: 0.65;
    }

label {
      display: block;
      margin-bottom: 0.5rem;
    }

input[type="text"] {
      display: block;
      width: 100%;
      padding: .375rem .75rem;
      font-size: 1rem;
      font-weight: 400;
      line-height: 1.5;
      color: #212529;
      background-color: #fff;
      background-clip: padding-box;
      border: 1px solid #ced4da;
      appearance: none;
      border-radius: .25rem;
      transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;
    }

input[type="text"]:focus {
      color: #212529;
      background-color: #fff;
      border-color: #86b7fe;
      outline: 0;
      box-shadow: 0 0 0 0.25rem rgb(13 110 253 / 25%);
    }

input.is-invalid {
      border-color: #dc3545;
      padding-right: calc(1.5em + .75rem);
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23dc3545'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23dc3545' stroke='none'/%3e%3c/svg%3e");
      background-repeat: no-repeat;
      background-position: right calc(.375em + .1875rem) center;
      background-size: calc(.75em + .375rem) calc(.75em + .375rem);
      background-color: #fff;
    }

.invalid-feedback {
      display: none;
      width: 100%;
      margin-top: .25rem;
      font-size: .875em;
      color: #dc3545;
    }

.is-invalid~.invalid-feedback {
      display: block;
    }

.captcha__image-reload {
      display: flex;
      align-items: center;
      margin-bottom: 0.5rem;
    }

.captcha__image {
      border-radius: 0.25rem;
    }

.captcha__refresh {
      margin-left: 0.5rem;
    }

.captcha__refresh::before {
      content: "";
      width: 16px;
      height: 16px;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='currentColor' class='bi bi-arrow-repeat' viewBox='0 0 16 16'%3E%3Cpath d='M11.534 7h3.932a.25.25 0 0 1 .192.41l-1.966 2.36a.25.25 0 0 1-.384 0l-1.966-2.36a.25.25 0 0 1 .192-.41zm-11 2h3.932a.25.25 0 0 0 .192-.41L2.692 6.23a.25.25 0 0 0-.384 0L.342 8.59A.25.25 0 0 0 .534 9z'/%3E%3Cpath fill-rule='evenodd' d='M8 3c-1.552 0-2.94.707-3.857 1.818a.5.5 0 1 1-.771-.636A6.002 6.002 0 0 1 13.917 7H12.9A5.002 5.002 0 0 0 8 3zM3.1 9a5.002 5.002 0 0 0 8.757 2.182.5.5 0 1 1 .771.636A6.002 6.002 0 0 1 2.083 9H3.1z'/%3E%3C/svg%3E");
    }

.captcha__group {
      margin-bottom: 1rem;
    }

.d-none {
      display: none;
    }

.form-result {
      background-color: #e8f5e9;
      padding: 1rem;
      margin-bottom: 1rem;
      border: 1px solid #e8f5e9;
      border-radius: .25rem;
      color: #2e7d32;
    }
  </style>
</head>

<body>

<div class="form-result d-none">Форма успешно отправлена!</div>

<form id="form" action="/examples/libs/captcha/process-form.php" method="post" novalidate>
      
      <div class="captcha">
        <div class="captcha__image-reload">
          <img class="captcha__image" src="/examples/libs/captcha/captcha.php" width="132" alt="captcha">
          <button type="button" class="captcha__refresh"></button>
        </div>
        <div class="captcha__group">
          <label for="captcha">Код, изображенный на картинке</label>
          <input type="text" name="captcha" id="captcha">
          <div class="invalid-feedback"></div>
        </div>
      </div>
      
      <button type="submit">Отправить</button>
    </form>

</div>

const refreshCaptcha = (target) => {
      const captchaImage = target.closest('.captcha__image-reload').querySelector('.captcha__image');
      captchaImage.src = '/examples/libs/captcha/captcha.php?r=' + new Date().getUTCMilliseconds();
    }

const captchaBtn = document.querySelector('.captcha__refresh');
    captchaBtn.addEventListener('click', (e) => refreshCaptcha(e.target));

</body>

</html>