This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The label property of the HTMLOptGroupElement interface is a string value that reflects the <optgroup> element's label attribute, which provides a textual label to the group of options.
A string.
const optionGroup = document.getElementById("groupB");
console.log(optionGroup.label);
optionGroup.label = `${optionGroup.label} (${optionGroup.children.length})`;
| Specification |
|---|
| HTML> # dom-optgroup-label> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
label |
1 | 12 | 1 | ≤12.1 | 3 | 18 | 4 | ≤12.1 | 1 | 1.0 | 4.4 | 1 |
<optgroup>label attribute
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLOptGroupElement/label