JAVASCRIPT

input clear

document.getElementById("msg").value = "";

clear input field javascript

<form id="myForm">
  First name: <input type="text" name="fname" value="Demo"><br>
  Last name: <input type="text" name="lname"><br><br>
    <input type="file" name="Photo" class=" custom-file-input" id="photo">
  <input type="button" onclick="myFunction()" value="Reset form">
</form>
     
<script>
function myFunction() {
    document.getElementById("myForm").reset();
}
</script>
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clear input fild

document.getElementById('inpu').value = ''

<input type="text" onfocus="this.value=''" value="Blabla">