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adding text to an existing text element in javascript via DOM

I am trying to figure how to add text to a p tag or h1 tag that already has a text node.

For example:

var t = document.getElementById("p").textContent;
var y = document.createTextNode("This just got added");

t.appendChild(y);
<p id="p">This is some text</p>
question from:https://stackoverflow.com/questions/65946049/how-do-i-get-text-in-html-element-with-javascript

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The reason that appendChild is not a function is because you're executing it on the textContent of your p element.

You instead just need to select the paragraph itself, and then append your new text node to that:

var paragraph = document.getElementById("p");
var text = document.createTextNode("This just got added");

paragraph.appendChild(text);
<p id="p">This is some text</p>

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