How to Input text onblur in Html

Just copy & paste this on input section
 onFocus="if(this.value=='Username'){this.value=''}" onBlur="if(this.value==''){this.value='Username'}"
then change the all Value"" are same.
value="Username"

OR

<script type="text/javascript"> function clearText(field) { if (field.defaultValue == field.value) field.value = ''; else if (field.value == '') field.value = field.defaultValue; } </script> copy and paste the below code in input area: ---------------------------------------------------- onFocus="clearText(this)" onBlur="clearText(this)" like as: <input name="name" type="text" value="Username" onFocus="clearText(this)" onBlur="clearText(this)">