:optional
Targets form elements (like <input> or <select>) that do NOT have the 'required' attribute.
Syntax
/* Usage Example */
input:optional {
/* Adds a subtle indicator for optional fields */
border-left: 3px solid #cbd5e1;
}:optional Browser support
Widely available
Since
2015 96% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.
10+
4+
5+
12+
Your first month is free
Managed WordPress hosting for faster sites.
Learn more