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Differences between innerText, innerHTML and textContent in JAVA SCRIPT

Definition and Usage..
innerText returns: "This element has extra spacing and contains a span element."
innerHTML returns: " This element has extra spacing and contains a span element."
textContent returns: " This element has extra spacing and contains a span element."
The innerText property returns just the text, without spacing and inner element tags.
The innerHTML property returns the text, including all spacing and inner element tags.
The textContent property returns the text with spacing, but without inner element tags
CODING:
<!DOCTYPE html>
<html>
<body>
<h3>Differences between innerText, innerHTML and textContent.</h3>
<p id="demo">   This element has extra spacing     and contains <span>a span element</span>. <span style="display:none">hidden span element</span></p>
<button onclick="getInnerText()">Get innerText</button>
<button onclick="getHTML()">Get innerHTML</button>
<button onclick="getTextContent()">Get textContent</button>
<p><strong>Note:</strong> The textContent property is not supported in Internet Explorer 8 and earlier, and the innerText property is not supported in IE9 and earlier.</p>
<p id="demo"></p>
<script>
function getInnerText() {
    alert(document.getElementById("demo").innerText)
}
function getHTML() {
    alert(document.getElementById("demo").innerHTML)
}
function getTextContent() {
    alert(document.getElementById("demo").textContent)
}
</script>
</body>
</html>

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