Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Electron Version

13.1.6 , 14.0.0-beta12

What operating system are you using?

Windows

Operating System Version

Win7 and Win10

What arch are you using?

ia32

Last Known Working Electron version

No response

Expected Behavior

Displaying a PDF document Ok

pageCode :

<iframe src='/static/libs/PDF.js/web/viewer.html?file=./sourceDoc.pdf' width='100%' height='100%'></iframe>

It's Ok On Chrome Browser!

Actual Behavior

Show PDF with PDF.js！
pageCode :

<iframe src='/static/libs/PDF.js/web/viewer.html?file=./sourceDoc.pdf' width='100%' height='100%'></iframe>

Show Ok with Chrome Browser! But Show Blank with electron！

Testcase Gist URL

No response

Additional Information

No response