Browser Link feature in Visual Studio Preview 2013

Browser Link feature in Visual Studio Preview 2013

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Browser Link is just a channel between your Visual Studio IDE and any open browser. This will allow dynamic data exchange between your web application and Visual Studio.

This feature is enabled by default in Visual Studio 2013 Preview. When Browser Link is enabled we register an HTTPModule with ASP.NET, which will then inject a <script> reference to every page request from the server. It is this JavaScript that does the magic of connecting the browser to Visual Studio. For Preview, we have a feature called the “Refresh Linked Browsers” that makes use of this channel between browsers and IDE.

Because the browser-side code is all JavaScript, it should work on all browsers, without requiring any other browser plug-in. It also works on iPad/ iPhone emulators. The connection between the browser and Visual Studio uses SignalR, an ASP.NET technology for bi-directional communication over HTTP. When Browser link is enabled, Visual Studio acts as a SignalR server, to which multiple clients (the browsers) can connect.


Let me try to walk you through the feature with a few questions:

1. What does the Browser Link feature look like?

As mentioned earlier, “Refresh Linked Browser” is the only feature that we have for Preview. This shows up with a little Refresh icon image  in your toolbar next to debug drop down .

This feature becomes active as soon as you navigate to a page in your current project. You could do F5, Ctrl+F5, “View in Browser” or open any browser and paste your requested url to get this started.

In the image below you can see that:

1.  “Refresh Linked Browsers” is active as you may have browsers opened at this point.

2.  Brower Link feature is ON by default.

3.  “Refresh Linked Browsers” has a keyboard shortcut (Ctrl+Alt+Enter).


2. How will I know which browsers are connected to VS?

Once you navigate to your page using various browsers, they will be listed in a tooltip as you hover over the Refresh icon image

The tooltip will look like the image below. Note that the tooltip shows how many browsers are connected. It also lists the connections with their respective urls.


If there are no browsers open for the project currently open in Visual studio, the tool tip will look like the image below. At this point you can do a View in Browser of a page to start the connection.


 3. How does “Refresh Linked Browsers” work?

Let us assume that you want to quickly see how “Default.aspx” renders in various browsers.

Start off with launching “Browse with” and select multiple browsers(IE, Firefox, Chrome etc). At this point, VS will show you that there are 3 browsers connected.

Make an edit to Default.aspx  file . Change text in <h1> </h1> to ASP.NET 4.5. Now click on the refresh button or do Ctrl+Alt+Enter to save and refresh the page. This will update all the browsers at once. Note that, this will only refresh the browser. It will not navigate to the page for you.


4. How do I know if Browser Link is turned ON?

Go to “View Source” of your rendered page and you will see a script tag at the very bottom. See image below. The presence of this script indicated that Browser Link feature is enabled.


4. How do I turn off Browser Link?

You can uncheck “Enable Browser Link” and it will be turned off “ Browser Link” for all future requests made.


You can also use the following appsettings in your web.config file.

1. Set appSetting “vs:EnableBrowserLink” to “false ““. This will  disable Browser Link.


2. Set debug= false in web.config file. This will  also disable Browser Link. Note that debug= true is required for Browser Link feature to work.


5. What is coming up for RTM?

For RTM we will have Browser Link available as an extensible API for users to write extensions that can talk to various browsers and VS. Stay tuned and we will be posting details of this soon.

 Known Browser Link issues for Preview:

1. The Browser Link script tag is injected after the body tag. This will be moved inside the body tag for the next release.

2. “Refresh Linked Browsers” will not work for HTML pages. This can be fixed by enabling  Run All Managed Modules in  your web.config settings.


3. Browser Link does not work for sites that aren’t hosted on localhost.

4. We do not work on default Website Templates. This is because  debug flag is set to false in web.config. You will have to set the debug flag to true for Browser Link to start working.



Reshmi Mangalore

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  • Hey guys,

    This is really a great feature. I had a problem with this though:

    Could you tell me what may be causing this? Would it be a bug?



  • Hi Leniel,

    Thank you for your feedback.

    I was not able to repo the issue with default 4.0/4.5 MVC template. Would you be able to share the MVC project that you are using? If so, please mail it to reshmim and xinqiu at with the details of the issue and we an start looking into it.



  • Microsoft PM Mads contacted Leniel and resolved his problem, see the stackoverflow link for details.

  • Love the feature, but here's another interesting bug:  (I didn't post the issue, but I can reproduce it and have experienced it as well).

  • Cool feature but actually stops working suddenly in W8.1 x64. No error messages but simply stops working or sometimes even not start  

  • @JH: Thank you for your feedback. This issue should be fixed in the upcoming release.

  • @ Juan Carlos Ruiz Pacheco : Thank you for your feedback. Can you please mail the details of this issue to reshmim at We would like to get a local repro of the issue. Thanks again!

  • Browser links are damn annoying. They insert scripts between the ending of body and the ending of html, and corrupts with my already existing jQuery... And some people think it has some problem with Require.JS...

  • @_bug_, Thanks for reporting.  It looks like it's been reported in .  We are actively contacting reporters from that connect bug.  Please contact reshmim at Microsoft dot com if you have repro project.  Thanks!

  • I see in the Mads video, that the site refresh automagically when the file is saved. But I'm forced to push the button (Or ctrl-alt-enter) Is there a problem with my installation?

  • @Eduardo, what Mads showed in //build is an experimental extension on top of browser link.  VS2013 preview doesn't have that feature.  In the future release, we'll release details on how to make extensions for browser link to enable such features.

  • I had a problem with the option checked. conflict  with __vwd/js/artery avoid some basic things of javascript work ok. See:

  • @rbuzeta : Thank you for your feedback. This issue has been fixed in the upcoming release.

  • There is No Connections on my Browser Link Dashboard. I installed Visual Studio 2013 RC in windows 7. Please help.

  • I'm using Web Essentials in VS 2013 Update 3.

    This is interesting... debugging in Chrome F12 tools shows when a style from a generated CSS maps through to an underlying .scss or mix-in file (magic made possible, I presume, via the generated file)

    Making changes in the browser fires off browser link to update the generated CSS file.  This is very cool, but it would be RAD if it respected the map and changes went all the way back to the .scss!  

    Perhaps this is possible through some configuration that I haven't figured out yet?

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