This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The multiple property of the HTMLSelectElement interface specifies that the user may select more than one option from the list of options. It reflects the <select> element's multiple attribute.
A boolean.
const selectElement = document.getElementById("comment");
console.log(selectElement.multiple);
| Specification |
|---|
| HTML> # dom-select-multiple> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
multiple |
1 | 12 | 1 | ≤12.1 | 3 | 18 | 4 | ≤12.1 | 1 | 1.0 | 4.4 | 1 |
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/multiple