How can I resize an image with JavaScript

I’m new to web development.
I have a webpage in PHP in which there is an image.
I want to post this photo on a blog with this script

<div id="x"></div>

var img = document.createElement("img");
img.src = "";
var src = document.getElementById("x");

how can I resize the image and put a link for the blog visitor to return to the image page?

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