Error encountered when trying to apply Internet Explorer CSS to local files without a server

I am currently working on an application that generates an HTML report. The issue I am facing is that when the application outputs the js and css files separately, Internet Explorer 8-10+ refuses to load the CSS files because of a "CSS was ignored due to MIME type mismatch" error. Since these are local files and not served by a server, it is impossible to modify the MIME.

In summary:

  • Local files (C:\,file://,etc)
  • CSS Won't load due to "MIME type mismatch"
  • Works in every other browser without issue -_-
  • Not "http://" or "localhost" or any variant

Does anyone have suggestions for how to work around this issue?

HTML loading of CSS:

<head>
    <title>Results</title>
    <link href='resources/bootstrap.min.css' rel='stylesheet' type='text/css' />
    <link href='resources/bootstrap-responsive.min.css' rel='stylesheet' type='text/css' />
    <link href='resources/style.css' rel='stylesheet' type='text/css' />
    <meta name='viewport' content='width=device-width, initial-scale=1.0'>    
</head>

Note: According to Microsoft, the fix is: "Ensure style sheet file is delivered with the proper HTTP response header, which includes a content type of text\css. See MIME-Handling Changes in Internet Explorer for more information.", but obviously impossible, as no header's are being sent across the wire......

Answer №1

Having encountered the same issue while using Windows 8.1 and IE11, here is the solution I found:

  1. To resolve this problem, begin by searching for "regedit.exe" on your computer (access the start menu and locate the search button in the top-right corner of the screen).
  2. After opening regedit, navigate to "HKEY_CLASSES_ROOT" in the left column and then select ".css".
  3. In the right column, double-click on "Content Type" to open a dialog box.
  4. Within the dialog box, modify the "value data" to read as "text/css".
  5. Click "Ok" to save the changes.

I trust that this solution will assist others facing similar issues.

Answer №2

After experimenting on various devices, I discovered that setting a CSS file to open with a specific program can cause Internet Explorer from loading properly and will display the error message mentioned above -_-

To address this issue, I am taking preventive measures by adding a CDN version of the CSS at the conclusion of the file to ensure the report functions correctly regardless of internet connectivity.

Answer №3

During my project with Tomcat and JSP, an interesting solution emerged. I found that by inserting <%@page contentType="text/css" %> at the beginning of the CSS file, Tomcat could serve it as a CSS mimetype. It was a simple yet effective workaround for ensuring proper rendering.

Answer №4

One issue I encountered was that the folder hosting the CSS had permission settings different from the page where the CSS needed to be applied. After aligning the permissions, everything worked smoothly.

Answer №5

Kyeemagh, 23 May -14

Greetings to those experiencing issues with Internet Explorer displaying "CSS was ignored due to mime type mismatch" on local files (no server).

After two days of searching online and consuming copious amounts of coffee, I discovered a solution for this problem on my Win7 with IE11.

To resolve the issue, please visit the first link provided below and scroll down to find the instructions under "3 Answers". It worked perfectly on my laptop.

CSS not rendered in IE 10

For more detailed information and the original source, click on:

I hope this solution proves helpful to you as well.

Now, I can view all my web pages accurately from my C: drive without relying on a server, using the IE11 browser.

Make sure your html page has the correct coding in the section that links to an external css file.

  • Feel free to share this valuable information with anyone facing similar challenges!

Thank you,

Dionysios

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