This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The required property of the HTMLTextAreaElement interface specifies that the user must fill in a value before submitting a form. It reflects the <textarea> element's required attribute.
A boolean.
const textareaElement = document.getElementById("comment");
console.log(textArea.required);
| Specification |
|---|
| HTML> # dom-textarea-required> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
required |
4 | 12 | 4 | ≤12.1 | 5 | 18 | 4 | ≤12.1 | 5 | 1.0 | 4.4 | 5 |
<textarea>HTMLTextAreaElement.validity:required pseudo-class
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLTextAreaElement/required