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javascript - How to add content to html body using JS?

I have many <section> in my html <body> and want to add more through javascript. However, using innerHTML is just replacing my existing sections with new ones, instead of adding them to the old ones.

What else can I use?

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You can use

document.getElementById("parentID").appendChild(/*..your content created using DOM methods..*/)

or

document.getElementById("parentID").innerHTML+= "new content"

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