Refused to apply style because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

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Posted on 26 Jan 2024 06:12:15 by Shaheer Ahmad

2,194 Moderator

Hello,

I am working on a Power Pages website. We seem to encounter this error on every page. I've tried searching for thumbnail.css but couldn't find any documentation regarding it. Its not even mentioned here:
Power Pages: Manage CSS

Can somebody please explain the root & solution of these errors?

Refused to apply style from 'https://<url>/thumbnail.css?1706249049000' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

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Shaheer Ahmad 2,194 Moderator on 29 Jan 2024 at 07:29:00

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Re: Refused to apply style because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

I now downloaded the thumbnail.css from portal's web file and stored it as a local backup. After opening the CSS file, I noticed HTML/JS content from my home screen. I created a copy and removed all the HTML and JS and left the CSS as is (Although it was the CSS from my portal's home page). and uploaded the file. Now the error's gone. Not sure if it will effect any functionality. If it does, I'll add a new reply to this thread. Meanwhile everything is working fine.