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W3Schools is optimized for learning, testing, and training. JS does not use normal callbacks, it uses Promises. Promises and callbacks do almost the same thing, but Promises helps in writing cleaner code. Instead of writing callbacks such as success or error here and there in your code, you just chain the various callbacks involved by a then for success or catch for error.
Coming back to PDF. JS, it returns a Promise variable on each asynchronous operation request. When the asynchronous operation is completed, the Promise involved receives a parameter in the callback function. JS APIs work in this way. When you include the script files of PDF. This object provides a number of APIs that you can call in your Javscript code.
You can also pass binary data as a parameter. If you have a base encoded data, you can convert it to a binary string through atob function. Note that this function just loads the page, and not renders the page on the screen. This is not an asynchronous call, so dimensions are returned immediately. The return value is a Promise.
In this tutorial, a canvas element is used. Go to PDF. JS Github Page and download the files. There will be 2 files in the "build" directory.
Include them in your HTML. In this tutorial, version 1. JS has been used. JS files are pretty huge.
It is better if you minify them. You can use an online UglifyJS minifier. Remember page rendering is asynchronous, it will take at least a few milliseconds to render a page.