How to change WebKit's error message for required HTML form fields

Gecko allows you to set the error message for required HTML form fields with x-moz-errormessage开发者_如何学JAVA.

What's the equivalent for WebKit?

While the setCustomValidity() example linked above works, it doesn't take into account the native HTML5 validation test, and instead supplies its own custom test. If you'd instead like to use the type match / pattern match from HTML5, then use setCustomValidity() with an oninvalid event:

<input type="text" pattern="[a-zA-Z]+"
oninvalid="setCustomValidity('Custom Message')" />

However bear in mind that this will not be localized to the user's browser language, and will also display regardless of what is invalid (e.g. it will also display if it fails the required check)

I'm almost certain there isn't, and it doesn't look like it's going to happen: http://www.w3.org/Bugs/Public/show_bug.cgi?id=10923.

You might want to check out setCustomValidity(). It seems to work fine in Chrome for me: http://olav.dk/wf2/demo/validation.asp.

Source: http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#dom-cva-setcustomvalidity