Assuming you have something like this:
<div id="somecontent"><video ...><p>Video Caption</p></div>
You can use simple DOM scripting to select the element and replace its contents:
<script>
var element = document.getElementById("somecontent");
element.innerHTML = "<audio><p>New Caption</p>"
</script>
You would then tie this replacement to the onclick event of an input or a link styled to look like a button.
Hope this helps.
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solved Complete change and adding of content in webpage [closed]