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I am working on client side web part using JavaScript and CSS for customization.

I have added custom css and JS into the page and I am getting the message on console of the browser i.e.

CSS was ignored due to mime type mismatch

I checked the paths of the CSS files and all of them are correct. I searched over the internet for the same issue and applied following paths, but none of them worked.

  • Installed the Core update in SharePoint available here.

  • Installed the Language Update Pack available here

  • Checked the Static Content feature is installed in the machine

  • Mime Type is available in IIS

  • Checked the Registry for the CSS and it has proper file type mentioned i.e. text/css.

The above solutions did not work.

The interesting part is: when I am loading the same css from SharePoint Hive (15) it is loading properly.

Can someone please help me out for solving the issue.

Environment: SP2019 Windows Server 2019 Standard Evaluation

TIA.

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for anyone facing this problem, the solution is to go to

  • Open Server Manager
  • Add roles and features Role-based or feature-based installation

Click Web Server (IIS) -> Management Tools -> check IIS 6 Management Compatibility

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