Certain features in WebViewer is not functioning in Internet Explorer and raise script errors

WebViewer Version:

Using 8.6.1 but can also be replicated when using in IE browser with the demo link JavaScript PDF Viewer Demo

Do you have an issue with a specific file(s)?

Can you reproduce using one of our samples or online demos?

Are you using the WebViewer server?

Does the issue only happen on certain browsers?
Yes in Internet Explorer

Is your issue related to a front-end framework?

Is your issue related to annotations?

Please give a brief summary of your issue:
(Think of this as an email subject)
WebViewer features are not working or giving errors . Please refer to the screenshots
Can be replicated in the online demo website JavaScript PDF Viewer Demo

Please describe your issue and provide steps to reproduce it:
(The more descriptive your answer, the faster we are able to help you)
Uploading Screenshots with the issues

Please provide a link to a minimal sample where the issue is reproducible:

Hello, I’m Ron, an automated tech support bot :robot:

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Thank you for contacting WebViewer Support.

Unfortunately we don’t give support to IE issues on WebViewer versions greater than 5.2.

Best Regards,
Dandara Navarro
Web Software Developer
PDFTron Systems, Inc.