This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The checkValidity() method of the HTMLFieldSetElement interface checks if the element is valid, but always returns true because <fieldset> elements are never candidates for constraint validation.
Note: The :valid and :invalid CSS pseudo-classes are applied to <fieldset> elements based on the validity of its descendant form controls, not the fieldset itself.
checkValidity()
None.
A boolean value, true.
In the following example, calling checkValidity() returns true.
const element = document.getElementById("myFieldSet");
console.log(element.checkValidity());
| Specification |
|---|
| HTML> # dom-cva-checkvalidity-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 | |
checkValidity |
4 | 12 | 4 | ≤12.1 | 5 | 18 | 4 | ≤12.1 | 5 | 1.0 | 4.4 | 5 |
HTMLFieldSetElement.reportValidity()<fieldset><form>
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLFieldSetElement/checkValidity