CSS :optional Pseudo Class

The :optional selector selects those elements that are optional.

Form elements are optional when attribute is not required. Form elements that can be selected using :optional are <input>, <select> and <textarea> without a required attribute.

Version

CSS3

Syntax

:optional {
css declarations;
}

Example

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      .example {
      margin: 40px auto;
      max-width: 400px;
      }
      label,
      button {
      display: block;
      width: 100%;
      margin-bottom: 1.5em;
      }
      input,
      select,
      button {
      padding: .4em 1em;
      }
      input,
      select {
      border: 1px solid #666666;
      }
      input:optional,
      select:optional {
      background-color: #eeeeee;
      color: #666666;
      opacity: 0.5;
      transition: .3s;
      }
      input:optional:hover,
      select:optional:hover {
      opacity: 1;
      }
      input:required,
      textarea:required {
      border-bottom: 3px solid #1c87c9;
      }
    </style>
  </head>
  <body>
    <h2>:optional selector example</h2>
    <div class="example">
      <form action="#">
        <label>
        <input type="name" required>Name *
        </label>
        <label>
        <input type="email" required>Email *
        </label>
        <label>
        <input type="phone">Phone (optional)
        </label>
        <label>
        <input type="url">Address (optional)
        </label>
      </form>
    </div>
  </body>
</html>

In the given example both the :optional and the :required pseudo-class selectors are used.


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