CustomStateSet: add() method
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The add
method of the CustomStateSet
interface adds an item to the CustomStateSet
, after checking that the value is in the correct format.
Syntax
js
add(value)
Parameters
value
-
A string which must be a
<dashed-ident>
, with the form--mystate
.
Return value
Undefined.
Exceptions
SyntaxError
DOMException
-
Thrown if the string is not a
<dashed-ident>
.
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 |
---|
Custom State Pseudo Class # dom-customstateset-add |
Browser compatibility
BCD tables only load in the browser