Trigger standard HTML validation (form) without using submit button? [duplicate]

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You can use reportValidity, however it has poor browser support yet. It works on Chrome, Opera and Firefox but not on IE nor Edge or Safari:

var myform = $("#my-form")[0];
if (!myform.checkValidity()) {
    if (myform.reportValidity) {
        myform.reportValidity();
    } else {
        //warn IE users somehow
    }
}

(checkValidity has better support, but does not work on IE<10 neither.)

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