<form action="">
  <fieldset>
    <legend>Without Contents</legend>
    <div class="control">
      <label for="input">input:</label>
      <input type="text" id="input" placeholder="input element">
    </div>
    <div class="control">
      <label for="textarea">textarea:</label>
      <textarea name="textarea" id="textarea" cols="30" rows="2"></textarea>
    </div>
    <div class="control">
      <label for="select">select:</label>
      <select name="select" id="select">
        <optgroup label="Default">
          <option value="opationA">optionA</option>
        </optgroup>
        <option value="optionB">optionB</option>
      </select>
    </div>
    <div class="control">
      <label for="checkbox">checkbox:</label>
      <input type="checkbox" name="checkbox" id="checkbox">
      checkbox
    </div>
    <div class="control">
      <label for="radio">radio:</label>
      <input type="radio" name="radio" id="radio">
      radio
    </div>
    <div class="control">
      <label for="range">range:</label>
      <input type="range" name="range" id="range" min="0" max="50" value="25" step="1">
    </div>
    <div class="control">
      <label for="submit">submit:</label>
      <input type="submit" name="submit" id="submit">
    </div>
    <div class="control">
      <button>button</button>
    </div>
    <div class="control">
      <details>
        <summary>Copying... </summary>
        <dl>
          <dt>Transfer rate:</dt>
          <dd>452KB/s</dd>
          <dt>Local filename:</dt>
          <dd>/home/rpausch/raycd.m4v</dd>
        </dl>
      </details>
    </div>
    <div class="control">
      <label for="meter">meter: </label>
      <meter min="0" max="100" value="75" name="meter" id="meter"></meter>
    </div>
    <div class="control">
      <label for="progerss">progress: </label>
      <progress min="0" max="100" value="75" name="meter" id="meter"></progress>
    </div>
  </fieldset>

  <fieldset class="contents">
    <legend>With Contents</legend>
    <div class="control">
      <label for="input">input:</label>
      <input type="text" id="input" placeholder="input element">
    </div>
    <div class="control">
      <label for="textarea">textarea:</label>
      <textarea name="textarea" id="textarea" cols="30" rows="2"></textarea>
    </div>
    <div class="control">
      <label for="select">select:</label>
      <select name="select" id="select">
        <optgroup label="Default">
          <option value="opationA">optionA</option>
        </optgroup>
        <option value="optionB">optionB</option>
      </select>
    </div>
    <div class="control">
      <label for="checkbox">checkbox:</label>
      <input type="checkbox" name="checkbox" id="checkbox">
      checkbox
    </div>
    <div class="control">
      <label for="radio">radio:</label>
      <input type="radio" name="radio" id="radio">
      radio
    </div>
    <div class="control">
      <label for="range">range:</label>
      <input type="range" name="range" id="range" min="0" max="50" value="25" step="1">
    </div>
    <div class="control">
      <label for="submit">submit:</label>
      <input type="submit" name="submit" id="submit">
    </div>
    <div class="control">
      <button>button</button>
    </div>
    <div class="control">
      <details>
        <summary>Copying... </summary>
        <dl>
          <dt>Transfer rate:</dt>
          <dd>452KB/s</dd>
          <dt>Local filename:</dt>
          <dd>/home/rpausch/raycd.m4v</dd>
        </dl>
      </details>
    </div>
    <div class="control">
      <label for="meter">meter: </label>
      <meter min="0" max="100" value="75" name="meter" id="meter"></meter>
    </div>
    <div class="control">
      <label for="progerss">progress: </label>
      <progress min="0" max="100" value="75" name="meter" id="meter"></progress>
    </div>
  </fieldset>
</form>

<div class="form">
  <span>display:</span>
  <label for="initial">
    <input type="radio" id="initial" name="display" value="initial" checked />
    initial
  </label>
  <label for="contents">
    <input type="radio" id="contents" name="display" value="contents" />
    contents
  </label>
  <label for="none">
    <input type="radio" id="none" name="display" value="none" />
    none
  </label>
</div>

@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;
  font-family: "Exo", Arial, sans-serif;
  background-color: #557;
  padding: 2rem 0;
  color: #fff;

  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 20px;
}

form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 20px;
  width: 100%;
  max-width: 60vw;
  font-size: 16px;
}

fieldset {
  padding: 10px;
}

.control {
  display: flex;
  alig-items: center;
  gap: 10px;
}

.control + .control {
  margin-top: 16px;
}

.form {
  display: flex;
  justify-content: center;
  gap: 10px;
  font-size: 1.5rem;
}

.form label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.form input {
  width: 18px;
  height: 18px;
}

.contents,
.contents legend,
.contents label,
.contents input,
.contents select,
.contents button,
.contents details,
.contents summary,
.contents meter,
.contents progress {
  display: var(--display, initial);
}

const rootEle = document.documentElement;
const inputs = document.querySelectorAll('input[type="radio"]');

inputs.forEach((input) => {
  input.addEventListener("click", (etv) => {
    rootEle.style.setProperty("--display", etv.target.value);
  });
});