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Created Third-party viewer usage (markdown)

Tim van der Meij 2020-02-18 23:58:51 +01:00
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The default viewer is built on the display layer and is the UI for PDF viewer in Firefox and the other browser extensions within the project. It can be a good starting point for building your own viewer. <em>However, we do ask if you plan to embed the viewer in your own site, that it not just be an unmodified version. Please re-skin it or build upon it.</em>
### Initialization promise
For custom deployment it is often necessary to know when the viewer is fully initialized. Previously this was possible by listening to the `localized` event, but pull request #11607 implemented a simpler way to do this:
```
document.addEventListener("webviewerloaded", function() {
PDFViewerApplication.initializedPromise.then(function() {
// The viewer has now been initialized.
})
});
```