Show preview of post changes on page

It is HTML and Javascript territory.

For the image preview, you may need a input type="file" with accept="image/*" and onchange event handler for the preview and the javascript getElementById to get the image id to display for preview. Have a look at these examples.

For the text preview part here is a fiddle link. It uses textarea for input, an empty html div with an id for the preview and the keyup javascript method as an event handler. For your title modify textarea with input type="text".

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