This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The value property of the HTMLTextAreaElement interface represents the value of the <textarea> element as a string, which is an empty string if the widget contains no content. It returns or sets the raw value contained in the control.
A string containing the contents of the <textarea> element.
const textareaElement = document.getElementById("comment");
const oldText = textArea.value;
textArea.value = oldText.toUpperCase();
| Specification |
|---|
| HTML> # dom-textarea-value-dev> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
value |
1 | 12 | 1 | ≤12.1 | 1 | 18 | 4 | ≤12.1 | 1 | 1.0 | 4.4 | 1 |
<textarea>HTMLTextAreaElement.textLengthHTMLTextAreaElement.labelsHTMLTextAreaElement.selectionStartHTMLTextAreaElement.selectionEnd
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLTextAreaElement/value