CustomStateSet: add() method
Baseline
2024
Newly available
Since May 2024, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
The add method of the CustomStateSet interface adds value representing a custom state to the CustomStateSet.
Custom elements with a specific state can be selected using the :state() pseudo-class, specifying the desired state as an argument.
Syntax
js
add(value)
Parameters
value-
A string that represents the custom state.
Return value
Undefined.
Examples
The following function adds the state checked to a CustomStateSet.
js
class MyCustomElement extends HTMLElement {
set checked(flag) {
if (flag) {
this._internals.states.add("checked");
}
}
}
Specifications
| Specification |
|---|
| HTML # custom-state-pseudo-class |
Browser compatibility
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