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HTML

              
                <main>
  <h1>Register Your Cat</h1>
  <div id="error-message" tabindex="-1"></div>
  <p>* denotes required fields.</p>
  <form id="register" action="thank-you.html" method="post">
    <div class="container">
      <div class="item">
        <label for="name">Cat's name<span aria-hidden="true"> *</span></label>
        <p id="error1" class="error"></p>
        <input type="text" id="name" name="name" required aria-describedby="error1">
        <label for="email">Your email<span aria-hidden="true"> *</span></label>
        <p id="error2" class="error"></p>
        <input type="email" id="email" name="email" autocomplete="email" required aria-describedby="error2">
        <label for="birthday">Cat's birthday (optional)</label>
        <p id="error4" class="help">Birthday format is <em>mm/dd/yyyy</em>.</p>
        <input type="text" id="birthday" name="birthday" autocomplete="off" inputmode="numeric" aria-describedby="error4" pattern="^\s*(1[012]|0?[1-9])\/(3[01]|[12][0-9]|0?[1-9])\/((?:19|20)\d{2})\s*$" maxlength="10">
        <fieldset>
          <legend>Is your cat altered? <span aria-hidden="true"> *</span></legend>
          <label for="maybe"> <input name="altered" type="radio" id="maybe" checked>Not sure</label>
          <label for="yes"> <input name="altered" type="radio" id="yes">Yes</label>
          <label for="no"> <input name="altered" type="radio" id="no">No</label>
        </fieldset>
      </div>
      <div class="item">
        <label for="markings">Cat's markings<span aria-hidden="true"> *</span></label>
        <p id="error3" class="error"></p>
        <select required name="markings" id="markings" aria-describedby="error3">
          <option value=""> select an option </option>
          <option value="solid">Solid</option>
          <option value="multi">Multi-color</option>
          <option value="calico">Calico</option>
          <option value="tabby">Tabby</option>
          <option value="torbie">Torbie</option>
          <option value="tortoiseshell">Tortoiseshell</option>
          <option value="tuxedo">Tuxedo</option>
        </select>
        <fieldset id="colors">
          <legend aria-describedby="error5">Cat's colors <span aria-hidden="true"> *</span></legend>
          <p id="error5" class="help">Select at least 1 color.</p>
          <p><label for="black"> <input type="checkbox" id="black" name="black">Black</label></p>
          <p><label for="white"> <input type="checkbox" id="white" name="white">White</label></p>
          <p><label for="brown"> <input type="checkbox" id="brown" name="brown">Brown</label></p>
          <p><label for="orange"> <input type="checkbox" id="orange" name="orange">Orange</label></p>
          <p><label for="gray"> <input type="checkbox" id="gray" name="gray">Gray</label></p>
        </fieldset>
      </div>
    </div>
    <button type="submit">Send</button>
  </form>
</main>
<script src="https://kit.fontawesome.com/127c73a8ed.js" crossorigin="anonymous"></script>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css2?family=Libre+Franklin:[email protected];900&display=swap");
:root {
  --primary: #fc466b;
  --secondary: #fff;
  --tertiary: #222;
  --error: #fc466b;
  --gradient: linear-gradient(
    90deg,
    rgba(232, 2, 83, 1) 0%,
    rgba(132, 21, 161, 1) 82%
  );
}
body {
  background-color: var(--tertiary);
  color: var(--secondary);
  font-family: "Libre Franklin", sans-serif;
}
a,
a:visited {
  color: var(--primary);
}
a:hover,
a:focus,
a:active {
  border: 1px solid var(--primary);
}
main {
  margin: 1em auto;
  max-width: 50rem;
  min-width: 15rem;
  padding: 1em;
}
.container {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  flex-flow: row wrap;
  justify-content: space-between;
  column-gap: 3em;
}
.item {
  flex-grow: 2;
  flex-basis: 40%;
}
h1 {
  border-radius: 0.25em;
  padding: 0.25em;
  font-size: 3em;
  text-align: center;
  color: var(--secondary);
  margin-top: 0;
  background: rgb(232, 2, 83);
  background: var(--gradient);
}
label,
legend {
  font-size: 1.3em;
  font-weight: bold;
  display: block;
  margin-top: 1em;
}
legend {
  color: var(--secondary);
  padding: 0.25em;
  margin-top: 1em;
  text-align: left;
}
fieldset {
  background-color: var(--tertiary);
  margin: 1em 0;
  border: 1px solid var(--secondary);
  min-width: 15rem;
  border-radius: 0.25em;
}
fieldset label {
  font-weight: normal;
  display: inline;
  white-space: nowrap;
}
input[type="text"],
input[type="email"],
select {
  font-size: 1.3em;
  width: 97%;
  min-width: 15rem;
  padding: 0.25em;
  border: 1px solid var(--tertiary);
  border-radius: 0.25em;
}
input[aria-invalid="true"],
select[aria-invalid="true"] {
  border: 0.2em solid var(--error);
}
input[type="checkbox"],
input[type="radio"] {
  height: 2em;
  width: 2em;
  margin-right: 1em;
  margin-top: 1em;
}
button {
  font-weight: bold;
  background-color: var(--secondary);
  border: 0.1em solid var(--secondary);
  color: var(--tertiary);
  font-size: 2em;
  padding: 0.5em;
  width: 100%;
  margin-top: 1em;
  border-radius: 0.25em;
}
button:hover,
button:focus {
  background-color: #8415a1;
  color: var(--secondary);
}
.errors {
  padding: 1em;
  border: 0.2em solid var(--error);
  border-radius: 0.25em;
}
.error,
.help {
  margin-bottom: 1em;
  font-size: 1.1em;
}
.error {
  color: var(--error);
}
.help {
  color: #ccc;
}
.fas {
  padding-right: 0.5em;
}
.visually-hidden {
  border: 0 !important;
  clip: rect(0 0 0 0) !important;
  height: 1px !important;
  margin: -1px !important;
  overflow: hidden !important;
  padding: 0 !important;
  position: absolute !important;
  width: 1px !important;
}

              
            
!

JS

              
                const form = document.getElementById("register");
const nameField = document.getElementById("name");
const emailField = document.getElementById("email");
const markingsField = document.getElementById("markings");
const dateField = document.getElementById("birthday");
const colorField = document.getElementById("colors");
const errorContainer = document.getElementById("error-message");
const error1 = document.getElementById("error1");
const error2 = document.getElementById("error2");
const error3 = document.getElementById("error3");
const error4 = document.getElementById("error4");
const error5 = document.getElementById("error5");
const icon =
  '<span aria-hidden="true" class="fas fa-exclamation-triangle"></span><span class="visually-hidden">Error</span> ';

form.setAttribute("novalidate", true);

function clearErrors() {
  let errors = document.getElementById("errors");
  if (errors) {
    errors.remove();
  }
  error1.innerHTML = "";
  error2.innerHTML = "";
  error3.innerHTML = "";
  error4.innerHTML = "Birthday format is <em>mm/dd/yyyy</em>.";
  error5.innerHTML = "Select at least 1 color.";
  nameField.removeAttribute("aria-invalid");
  emailField.removeAttribute("aria-invalid");
  markingsField.removeAttribute("aria-invalid");
  dateField.removeAttribute("aria-invalid");
  colorField.classList.remove("errors");
  error4.classList.remove("error");
  error4.classList.add("help");
  error5.classList.remove("error");
  error5.classList.add("help");
}

function validateForm() {
  clearErrors();
  let hasErrors = false;
  let errors = document.createElement("ul");
  errors.id = "errors";
  if (nameField.value === "") {
    const error = document.createElement("li");
    error.innerHTML = '<a href="#name">Cat\'s name</a> is required.';
    errors.appendChild(error);
    nameField.setAttribute("aria-invalid", "true");
    error1.innerHTML = `${icon} Enter cat's name.`;
    hasErrors = true;
  }
  if (emailField.value === "") {
    const error = document.createElement("li");
    error.innerHTML = '<a href="#email">Your email</a> is required.';
    errors.appendChild(error);
    emailField.setAttribute("aria-invalid", "true");
    error2.innerHTML = `${icon} Enter your email.`;
    hasErrors = true;
  } else if (
    !/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(emailField.value)
  ) {
    const error = document.createElement("li");
    error.innerHTML =
      '<a href="#email">Your email</a> address is not formatted correctly.';
    errors.appendChild(error);
    emailField.setAttribute("aria-invalid", "true");
    error2.innerHTML = `${icon} Email format is <em>[email protected]</em>.`;
    hasErrors = true;
  }
  if (dateField.value !== "") {
    if (
      !/^(0[1-9]|1[0-2])\/(0[1-9]|1\d|2\d|3[01])\/(19|20)\d{2}$/.test(
        dateField.value
      )
    ) {
      const error = document.createElement("li");
      error.innerHTML =
        "<a href='#birthday'>Cat's birthday</a> is not in the correct format.";
      errors.appendChild(error);
      dateField.setAttribute("aria-invalid", "true");
      error4.classList.remove("help");
      error4.classList.add("error");
      error4.innerHTML = `${icon} Birthday format is <em>mm/dd/yyyy</em>.`;
      hasErrors = true;
    }
  }
  if (markingsField.value === "") {
    const error = document.createElement("li");
    error.innerHTML = '<a href="#markings">Cat\'s markings</a> is required.';
    errors.appendChild(error);
    markingsField.setAttribute("aria-invalid", "true");
    error3.innerHTML = `${icon} Select cat's markings.`;
    hasErrors = true;
  }
  let checkboxes = document.querySelectorAll("#colors input[type='checkbox']");
  let checked = false;
  checkboxes.forEach(function (checkbox) {
    if (checkbox.checked) {
      checked = true;
    }
  });
  if (!checked) {
    const error = document.createElement("li");
    error.innerHTML = "<a href='#colors'>Cat's colors</a> is required.";
    errors.appendChild(error);
    document.getElementById("colors").classList.add("errors");
    error5.innerHTML = `${icon} Select at least 1 color.`;
    error5.classList.remove("help");
    error5.classList.add("error");
    hasErrors = true;
  }
  if (hasErrors) {
    errorContainer.classList.add("errors");
    if (!errorContainer.querySelector("h2")) {
      const errorHeading = document.createElement("h2");
      errorHeading.innerHTML = "Fix these errors to continue:";
      errorContainer.appendChild(errorHeading);
    }
    errorContainer.appendChild(errors);
    errorContainer.focus();
    return false;
  }
  return true;
}

form.addEventListener("submit", function (e) {
  if (!validateForm()) {
    e.preventDefault();
  }
});

// Add slashes to birthday
dateField.addEventListener("keyup", function () {
  if (this.value.length === 2 || this.value.length === 5) {
    this.value += "/";
  }
});

              
            
!
999px

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