How to Define a Default Value for "Input Type=Text" Without Using Attribute 'Value'?

You should rather use the attribute placeholder to give the default value to the text input field.

e.g.

<input type="text" size="32" placeholder="1000" name="fee" />

You can change the name attribute by id, and set the value property using client script after the element is created:

<input type="text" id="fee" />

<script type="text/javascript">
document.getElementById('fee').value = '1000';
</script>

Here is the question: Is it possible that I can set the default value without using attribute 'value'?

Nope: value is the only way to set the default attribute.

Why don't you want to use it?

A non-jQuery way would be setting the value after the document is loaded:

<input type="text" id="foo" />

<script>
    document.addEventListener('DOMContentLoaded', function(event) { 
        document.getElementById('foo').value = 'bar';
    });
</script>

The value is there. The source is not updated as the values on the form change. The source is from when the page initially loaded.

this is working for me

<input defaultValue="1000" type="text" />

or

let x = document.getElementById("myText").defaultValue;