Update readme

Author: alekswebnet

README.md

@@ -1,6 +1,6 @@
 # pdfjs-viewer-element
 
-A custom element, based on [PDF.js default viewer](https://mozilla.github.io/pdf.js/web/viewer.html). Supported in all [major browsers](https://caniuse.com/custom-elementsv1) and works with most [JS frameworks](https://custom-elements-everywhere.com/). See [examples](https://alekswebnet.github.io/pdfjs-viewer-element/#demo) of usage in the different frameworks.
+A custom element, based on [PDF.js default viewer](https://mozilla.github.io/pdf.js/web/viewer.html). Supported in all [major browsers](https://caniuse.com/custom-elementsv1) and works with most [JS frameworks](https://custom-elements-everywhere.com/). See [examples](https://alekswebnet.github.io/pdfjs-viewer-element/#demo) of usage in Vue, React and Svelte or pure HTML.
 
 ⚠️ `pdfjs-viewer-element` requires PDF.js [prebuilt](http://mozilla.github.io/pdf.js/getting_started/), that includes the generic build of PDF.js and the viewer. To use the package you should [download](http://mozilla.github.io/pdf.js/getting_started/) and **place the prebuilt** files to some directory of your project. Then specify the path to this directory with `viewer-path` property (`/pdfjs` by default).
 
@@ -16,7 +16,7 @@ You have full access to PDF.js viewer application using `initialize` method.
 
 [Getting started](https://alekswebnet.github.io/pdfjs-viewer-element/)
 
-[Api](https://alekswebnet.github.io/pdfjs-viewer-element/#api)
+[API](https://alekswebnet.github.io/pdfjs-viewer-element/#api)
 
 [Live examples](https://alekswebnet.github.io/pdfjs-viewer-element/#demo)
 
@@ -74,12 +74,14 @@ For more clarity, see the [Api docs page](https://alekswebnet.github.io/pdfjs-vi
 `initialize` - using this method you can access PDFViewerApplication and use methods and events of PDF.js default viewer
 
 ```javascript
-document.addEventListener('DOMContentLoaded', async () => {
-  const viewer = document.querySelector('pdfjs-viewer-element')
-  // Wait for the viewer initialization, receive PDFViewerApplication
-  const viewerApp = await viewer.initialize()
-  // Open PDF file data using Uint8Array instead of URL
-  viewerApp.open(pdfData)
+const viewer = document.querySelector('pdfjs-viewer-element')
+// Wait for the viewer initialization, receive PDFViewerApplication
+const viewerApp = await viewer.initialize()
+// Open PDF file data using Uint8Array instead of URL
+viewerApp.open(pdfData)
+// Use event bus to handle viewer application events
+viewerApp.eventBus.on('pagesloaded', () => {
+  console.log('Viewer pages loaded')
 })
 ```