:optional
Quick Summary for :optional
:optional CSS pseudo-class represents any <input>, <select>, or <textarea> element that does not have the required attribute set on it.
Code Usage for :optional
/* Selects any optional <input> */ input:optional { border: 1px dashed black; } More Details for :optional
:optional
The :optional CSS pseudo-class represents any <input>, <select>, or <textarea> element that does not have the required attribute set on it.
/* Selects any optional <input> */ input:optional { border: 1px dashed black; } This pseudo-class is useful for styling fields that are not required to submit a form.
Note: The :required pseudo-class selects required form fields.
Syntax
:optional
Examples
The optional field has a purple border
HTML<form> <div class="field"> <label for="url_input">Enter a URL:</label> <input type="url" id="url_input"> </div> <div class="field"> <label for="email_input">Enter an email address:</label> <input type="email" id="email_input" required> </div> </form> label { display: block; margin: 1px; padding: 1px; } .field { margin: 1px; padding: 1px; } input:optional { border-color: rebeccapurple; border-width: 3px; } Accessibility concerns
If a form contains optional <input>s, required inputs should be indicated using the required attribute. This will ensure that people navigating with the aid of assistive technology such as a screen reader will be able to understand which inputs need valid content to ensure a successful form submission.
Required inputs should also be indicated visually, using a treatment that does not rely solely on color to convey meaning. Typically, descriptive text and/or an icon are used.
MDN Understanding WCAG, Guideline 3.3 explanations Understanding Success Criterion 3.3.2 | W3C Understanding WCAG 2.0Specifications
| Specification |
|---|
| HTML Standard # selector-optional |
| Selectors Level 4 # opt-pseudos |
See also
Other validation-related pseudo-classes::required, :invalid, :valid Form data validation Select your preferred language English (US)DeutschEspañolFrançais日本語Português (do Brasil)Русский中文 (简体) Change language
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986
