How to get all HTML content from DOMParser excluding the outer body tag ?

DOM (Document Object Model) allows us to dynamically access and manipulate the HTML data. All the text data from an HTML file can also be extracted using DOMParser. DOM parser returns an HTML/XML/SVG object. All the objects can be accessed using the [ ] operator in javascript. 
The HTML DOM Tree of objects:

Steps to get all the text from an HTML document using DOMParser: 

Step 1: Declare an instance of DOMParser. 

const parser = new DOMParser();

Step 2: Parse the document using .parseFromString() function. It takes two arguments, the string to be parsed and the type of document. 

const parsedDocument = parser.parseFromString(
        htmlInput, "text/html");

Step 3:Use doc.all element to access the whole HTML page, now get its root element which is stored at 0^th index. We can also use getElementByID() to get content of a specific element. 

var allText = parsedDocument.all[0].textContent;

Finally, we will use the textContent attribute of doc.all[0] to get the text from all HTML elements.

Example:

html

<title>This is the title</title>
<div>
    <span>Geeks for geeks</span>
    <p>Content to be parsed </p>
</div>

Output:

This is the title 
Geeks for geeks
Content to be parsed

Example : 

html

<h2>
    DomParser to get
    all HTML content
</h2>

<p>
    Click on the button Below
    to parse the HTML document
</p>

<!-- Paragraph element to
        show the output -->
<p id="output"> </p>

<!-- Button to call the
        parsing function -->
<button onclick="printOutput()">
    Parse now
</button>

<script>
    // Input HTML string to be parsed
    var htmlInput = `
        <title> This is the title </title>
        <div>
        <span>Geeks for geeks</span>
        <p> Content to be parsed </p>
        </div>
    `;

    // Created instance
    const parser = new DOMParser();

    // Parsing
    const parsedDocument =
                parser.parseFromString(
                htmlInput, "text/html");

    // Getting text
    function printOutput() {

        var allText = parsedDocument
                .all[0].textContent;

        // Printing on page and console
        document.getElementById("output")
                    .innerHTML = allText;

        console.log(parsedDocument
                    .all[0].textContent);
    }
</script>

Output:

How to get all HTML content from DOMParser excluding the outer body tag ?

The text content from individual components can also be retrieved using getElementsByClassName(‘className’) and getElementById(‘IDName’).
Javascript Function that takes the document to be parsed as a string and prints the result.

function parse(htmlInput) {

    // Creating Parser instance
    const parser = new DOMParser();

    // Parsing the document using DOM Parser
    // and storing the returned HTML object in
    // a variable
    const parsedDocument = parser
        .parseFromString(htmlInput, "text/html");

    // Retrieve all text content from DOM object
    var allText = parsedDocument.all[0].textContent;

    // Printing the output to webpage and
    console.log(parsedDocument.all[0].textContent);
}