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text/css

text/css MIME Type — CSS Content-Type & MIME Sniffing Prevention

Cascading Style Sheets. The styling language for HTML documents. Browsers block page rendering until CSS is loaded, making correct Content-Type critical — browsers refuse to apply stylesheets served with the wrong MIME type (MIME sniffing is blocked by X-Content-Type-Options: nosniff).

Type
text
Charset
UTF-8
Compressible
Yes (gzip/br)
Extensions
.css

Used For

  • Web page stylesheets
  • CSS custom property themes
  • Email style blocks (limited support)

HTTP Header Example

HTTP/1.1 200 OK
Content-Type: text/css; charset=utf-8
Cache-Control: public, max-age=31536000
X-Content-Type-Options: nosniff

Code Examples

// Express — serve CSS from public directory
import express from 'express'
app.use(express.static('public')) // serves .css with text/css automatically

// nginx — correct MIME type (types block)
# nginx.conf
types {
  text/css css;
}

// Inline CSS via <style> tag (no MIME type needed)
// <link rel="stylesheet" href="/style.css" type="text/css">

Related MIME Types

text/htmltext/javascript

All MIME Types

Browse the complete MIME type reference.

View All MIME Types

Frequently Asked Questions

What is the text/css MIME type?

Cascading Style Sheets. The styling language for HTML documents. Browsers block page rendering until CSS is loaded, making correct Content-Type critical — browsers refuse to apply stylesheets served with the wrong MIME type (MIME sniffing is blocked by X-Content-Type-Options: nosniff).

When should I set Content-Type: text/css?

Set Content-Type: text/css on HTTP responses that contain CSS data. Web page stylesheets.

What file extensions use text/css?

Files with text/css content typically use these extensions: .css.

What happens if I serve this with the wrong Content-Type?

Browsers use the Content-Type header to decide how to handle the response. Serving text/css content with an incorrect MIME type can cause browsers to display it incorrectly, refuse to execute it (scripts), or prompt an unintended download. Modern browsers respect X-Content-Type-Options: nosniff and will not attempt to auto-detect the type.