---
title: "Modernize Your CSS by Removing Outdated Vendor Prefixes | bseoa"
description: "Your stylesheet includes old 'vendor prefixes' (like -webkit- or -moz-). These were used in the past to make new CSS features work in specific browsers. Today,…"
image: "https://www.blackseoanalyzer.com/static/images/black-seo-analyzer-og-image.png"
canonical: "https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/vendor-prefixes"
language: "en"
---

# Modernize Your CSS by Removing Outdated Vendor Prefixes

CSS Analyzer

## What is this warning?

Your stylesheet includes old 'vendor prefixes' (like `-webkit-` or `-moz-`). These were used in the past to make new CSS features work in specific browsers. Today, most of these are no longer needed and just add extra weight to your files. It's time for a little spring cleaning!

## How to Fix This Issue

### How to Fix It

#### The Problem

```
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
```

#### The Solution

Remove the old prefixes and just use the standard property. For ensuring compatibility with older browsers, it's best to use a tool like Autoprefixer in your development process, which automatically adds only the prefixes that are still necessary.

```
border-radius: 5px;
```

#### Why This Works

Cleaning up old prefixes makes your CSS files smaller and easier to read. Using an automated tool for compatibility ensures you're supporting the right browsers without cluttering your code manually.

### SEO Impact

This issue can affect your site's search engine rankings and user experience. Addressing it promptly helps ensure optimal performance and visibility in search results.

### Automatic Detection

bseoa automatically checks for this warning during site analysis, along with hundreds of other technical SEO issues.

## Other CSS Analyzer issues

- [Avoid Using !important in CSS for Better Style Management](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/important-usage)
- [Clean Up Your Code by Replacing Inline Styles with CSS Classes](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/excessive-inline-style-attributes)
- [Eliminate Render-Blocking CSS to Drastically Improve Page Speed](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/render-blocking-stylesheets)
- [Ensure Readability by Setting Background Color with Text Color](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/text-color-without-background)
- [Fix Missing Stylesheet URL to Restore Site Appearance](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/missing-href-in-stylesheet)
- [Implement Responsive Design to Ensure Your Site is Mobile-Friendly](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/no-responsive-design)
- [Improve Accessibility and Consistency with a Unified CSS Unit Strategy](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/inconsistent-units)
- [Improve Page Speed by Moving Large Inline CSS to an External File](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/large-inline-stylesheet)
- [Increase Font Size for Better Mobile Readability and Accessibility](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/small-font-size)
- [Optimize Your CSS by Merging Duplicate Selectors](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/duplicate-css-selector)
- [Speed Up Page Load by Preloading Critical CSS](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/missing-preload-hint-for-stylesheet)
- [Streamline Your Code by Consolidating Print Stylesheets](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/multiple-print-stylesheets)
- [Strengthen Your Brand with a Consistent Color Palette](https://www.blackseoanalyzer.com/en/technical-seo/css-analyzer/too-many-color-variations)

## Ready to Unlock Your Site's Full SEO Potential?

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