# Introduction

Telerik is a pioneer in offering cross-browser compatible components for ASP.NET. This has been, is and will remain a top priority for the company. If adding new features is difficult, just think about doing so while maintaining cross-browser compatibility. This requires careful design work, extensive testing and very deep understanding of the intricacies of all platforms (browsers).

## Table of supported Browsers

The following tables list the browsers the UI for ASP.NET AJAX suite supports:

<table>
  <thead>
    <tr>
      <th align="left">BROWSER</th>
      <th align="left">SUPPORTED VERSIONS</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td align="left">Edge</td>
      <td align="left">The two latest versions at the time of the release.</td>
    </tr>
    <tr>
      <td align="left">Chrome</td>
      <td align="left">The two latest versions at the time of the release.</td>
    </tr>
    <tr>
      <td align="left">Firefox</td>
      <td align="left">The two latest versions at the time of the release, including applicable <a href="https://www.mozilla.org/en-US/firefox/organizations/faq/">Firefox Extended Support Release (ESR) versions</a>.</td>
    </tr>
    <tr>
      <td align="left">Opera</td>
      <td align="left">The two latest versions at the time of the release.</td>
    </tr>
    <tr>
      <td align="left">Safari (OS X)</td>
      <td align="left">The two latest versions at the time of the release.</td>
    </tr>
  </tbody>
</table>

The supported Firefox versions are determined for each Telerik UI for ASP.NET AJAX release. This page does not provide a fixed historical list of Firefox ESR versions. To identify the versions supported by a specific Telerik release, use its release date or version. For general information about Firefox ESR, see [Mozilla's Firefox ESR FAQ](https://www.mozilla.org/en-US/firefox/organizations/faq/).

<table class="Table k-table">
  <thead>
    <tr>
      <th>Mobile Browsers</th>
      <th>Version</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Safari Mobile</td>
      <td>iOS 9.0+</td>
    </tr>
    <tr>
      <td>Chrome Mobile</td>
      <td>Yes</td>
    </tr>
    <tr>
      <td>Opera Mobile</td>
      <td>14.0+</td>
    </tr>
    <tr>
      <td>Microsoft Edge Mobile</td>
      <td>latest</td>
    </tr>
  </tbody>
</table>

### Notes

* [End of support for Internet Explorer](https://www.telerik.com/blogs/end-internet-explorer-support-telerik-kendo-ui-web-components) as of R1 2023
* IE Compatibility Mode, which triggers IE7 emulation are not supported as of R3 2015
* The Quirks Mode rendering engine for Internet Explorer is not supported, since it is based on Internet Explorer 5.5
* Browsers in BETA stage are not supported

For best performance:

* JavaScript must be enabled on all browsers
* Caching must be activated
* Follow the best practices discussed at: [Optimizing Performance](https://docs.telerik.com/devtools/aspnet-ajax/getting-started/performance/optimizing-performance).