This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The size property of the HTMLSelectElement interface specifies the number of options, or rows, that should be visible at one time. It reflects the <select> element's size attribute. If omitted, the value is 0.
Note: While by default a <select> displays a single row unless multiple is true, in which case four rows are displayed, the default value for the size property is 0.
A number.
const selectElement = document.getElementById("fruits");
console.log(selectElement.size);
| Specification |
|---|
| HTML> # dom-select-size> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
size |
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/size