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When using HTML5 forms elements and validation, interrupt a browser's default invalidation message and plug in your own validation code (e.g., append an invalid class to the input and style accordingly).
document.addEventListener('invalid', (function(){
return function(e){
//prevent the browser from showing default error bubble/ hint
// optionally fire off some custom validation handler
})(), true);
function myvalidationfunction(e) {
// Do a thing
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