This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The willValidate read-only property of the HTMLFieldSetElement interface returns false, because <fieldset> elements are not candidates for constraint validation.
The boolean value false.
| Specification |
|---|
| HTML> # dom-cva-willvalidate-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 | |
willValidate |
2 | 12 | 4 | ≤12.1 | 4 | 18 | 4 | ≤12.1 | 3 | 1.0 | 4.4 | 3 |
HTMLFieldSetElement.checkValidity()<fieldset><form>
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLFieldSetElement/willValidate