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If the first and second fields have the same text despite the font and spaces, then delete the second one text
$(document).ready(function() {
var input_1 = $(".test_1");
var input_2 = $(".test_2");
$(input_2).focusout(function() {
if (input_1.val() === input_2.val()) {
$('.test_2').val('');
}
});
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<input value="dom" class="test_1">
<input value=" Dom" class="test_2">>Solution :
Perhaps you want a trim and a lowerCase?
$(function() {
const $input_1 = $(".test_1");
const $input_2 = $(".test_2")
.on("blur",function() {
const val1 = $input_1.val().trim().toLowerCase(),
val2 = $input_2.val().trim().toLowerCase();
console.log(val1,val2,val1 === val2);
if (val1 === val2) {
$input_2.val('');
}
});
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<input value="dom" class="test_1">
<input value=" Dom" class="test_2">