Error "customElements is not defined" when Knowledge base open.

Why can I get the error

customElements is not defined
ReferenceError: customElements is not defined

when opening the knowledge base?

This error is only found on some computers. Most users work without errors.

YT version: 2020.3.1402

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Thank you for reaching out. Please submit a support request and provide the following details for us to investigate:

1. Is it InCloud or standalone YouTrack?
2. If it's InCloud, please share your instance name
3. If it's standalone, please share full YouTrack logs as per
4. Attach a screenshot with the error

Thank you! We're looking forward to your reply. 


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