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[PDF.js] Prevent loading default pdf

This can be done by appending ?file= to the src path, like it is mentionend here.

<!-- "?file=" prevents loading the default document -->
<iframe id="pdf-js-viewer" src="/pdf/web/viewer.html?file=" title="webviewer" frameborder="0" width="100%" height="700" allowfullscreen="" webkitallowfullscreen=""/>

Or by setting the variable defaultUrl to blank using the onload event.

document.addEventListener("webviewerloaded", async () => {
   let pdfViewerIFrame = document.getElementById("pdf-js-viewer")
   //https://github.com/mozilla/pdf.js/blob/master/web/app_options.js
   pdfViewerIFrame.contentWindow.PDFViewerApplicationOptions.set("defaultUrl", "") //prevent loading default pdf
})

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