I just want to clarify that pdf.js and PDFTron’s WebViewer are separate products. This is why documentation for PDFTron’s WebViewer may overlap but not necessary work, as there are much more features in PDFTron’s WebViewer.
The correct documentation you should use for pdf.js is available here:
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Share how you are using PDF.js Express in your organization you could win a $500 Amazon gift card. All participants will receive 6 months of PDF.js Express+ for free. Learn more here