An JavaScript event fired at the beginning and the end of verification to hold the user waiting

[cqjjjzr]

Hello. I noticed the discussion at https://github.com/WICG/email-verification#have-you-looked-at-declarative-apis why Declarative HTML API wasn't the shape we took.

However, after testing the demos available at https://rowan.fyi/made/email-verification/ and reading the blog post from Google (https://developer.chrome.com/blog/email-verification-august-2026#progress_indicator), I noticed that if there is only one single E-Mail entry box in the form, possibilities are high that the user autocomplete or type the E-Mail and just 1) hit enter fast 2) use mouse to click the submit button before the verification happen.

To effectively promote the usage of EVP, I tend to believe that if the browser found EVP available, aside from popping up the dialog (it actually takes ~2s to pop up on my side), we should be able to hold the user from submitting the form prematurely.

An example:

<script>
form.addEventListener(`emailVerificationStarted`, () => {
    submitButton.setAttribute(`disabled`, `true`);
});

form.addEventListener(`emailVerificationFinished`, () => {
    submitButton.setAttribute(`disabled`, `false`);
});
</script>

Another possible solution is let the browser decide everything: if the email verification protocol is available, then the browser hold the form submission until it either obtains a token or fails.

Thank you.