A decade ago HTML and CSS added the ability to, at least signal, validation of form fields. The required attribute helped inform users which fields were

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David Walsh

 CSS :optional represents form elements that aren't required. In a sense, it feels like : optional represents :not([required]) , but :optional is limited to just form fields. A decade ago HTML and CSS added the ability to, at least signal, validation of form fields with required attribute.

CSS :optional

<p>Thank you! Once again I learned something helpful.</p>


<p><code>:optional</code> and <code>[required]</code> too! 😍</p>
