Test on different browser versions with VirtualBox

As web developers it is imperative to be constantly checking the websites we are working on in different browsers since they each have their specific ways of interpreting the code we write. The point is to make sure that our sites are presentable for as many different users as possible. There are other factors to consider like operating system and screen resolution, but in this article I want to concentrate on browsers, specifically their different versions and how we can get them to co-exist in the same machine — something that a browser like Internet Explorer doesn’t normally allow.  One way of doing this is by setting up virtual machines. In this article you will learn how to do that using VirtualBox, an incredibly powerful program that is free and will, for our purposes, grant us separate environments in which to install several versions of each browser.

A consistently usable and attractive browsing experience

Although it is a good start to check our websites in different browsers as we are coding them it is perhaps even more important to check them on different versions of those browsers: we can usually count on all of the latest versions supporting — to varying degrees — new technologies like HTML5 and CSS3, but at the same time we can always count on a significant number of users not having the latest versions of those browsers installed. That means they may miss out on those features specific to HTML5 and CSS3. It is generally agreed upon that it is bad practice to tell users to upgrade their browsers. Much better and more effective is to make sure that our code smoothly “downgrades” in those situations, presenting those users with an experience that is still relatively attractive and completely usable.


As I’ve mentioned the dilemma is that certain developers do not actually allow us to install several versions of their browsers. This is notoriously true for Internet Explorer. I also experienced it with Firefox, but apparently there is a very simple way around this. I have not tried it with other browsers, but considering that Internet Explorer is one of the most used browsers out there, it is critical to test on its older versions as well. This is particularly true since this specific browser comes pre-installed with Windows and less tech-savvy people may never upgrade it.

How does VirtualBox work?

vbox_logoHaving access to several computers in which to install the different versions of our browsers might technically seem like the perfect solution — if it weren’t severely impractical assuming that we even had access to several physical machines and were allowed to overwrite their browser installations.

Enter VirtualBox: a “virtualizer” that allows us to install several virtual machines (in essence operating systems) in just one physical machine. VirtualBox is free, user-friendly, chock-full of features and in contrast to some other virtualizers/emulators it is FAST! Plus it supports shared folders and virtual USB controllers in addition to the usual floppy and CDROM drive support.

The list of operating systems to choose from is huge; in fact I can’t think of any OS that is missing. But it is not a completely free ride for pirates: you do need to have the installation disk for your desired OS. The installation will be done as if on a physical machine.

Installing and using VirtualBox

To begin, grab a copy of VirtualBox here. After you’ve installed it, setting up different virtual machines is pretty straight-forward: just click on “New” and follow the wizard. Once you’re up and running with an OS installed in your virtual machine, there are several things you can do to make your VirtualBox experience even easier:

  • Clone your virtual machines. This is the first thing you should do after installing an OS in your virtual machine. It means that you will have a fresh copy of the installation ready for your next project or in case you mess something up. Always have a fresh copy available to avoid having to install the OS again. You can clone a virtual machine simply by right-clicking it in the VirtualBox Manager and choosing “Clone…”
  • Set up shared folders. This is very important if you’re planning to use your virtual machines to check your websites on different browsers.1 Failing to set up virtual folders means that you will have to constantly be copying updated files of your website to each individual virtual machine — killing your time, creativity, and sanity! It couldn’t be much easier to share folders between your host and your virtual “guest” OS:
    1. First you will need to install “Guest Additions.” From your virtual machine’s window, go to “Devices -> Install Guest Additions…” and follow the wizard. You only need to do this once in VirtualBox; shared folders will then work for all of your virtual machines.
    2. Now you are ready to set up shared folders. Go to “Devices -> Shared Folders…” and add the folders you would like access to by clicking on the little folder with a plus sign. Make sure to check “Make Permanent” for each folder you add, otherwise they will not be available when you restart the virtual machine.
    3. The folders you’ve shared from your host machine should now be available in your virtual machine. If it is running Windows you can access them by going to Start -> Run…, typing “explorer” and hitting enter.  On the window that pops up click the + arrow next to “My Network Places,” then the + arrow next to “Entire Network.” Finally click the + arrow next to “VirtualBox Shared Folders” and select the folder that is revealed. Note the address of that folder. An alternative to these steps is to simply type in that address. It may vary in different versions of VirtualBox, but for me the address is “\Vboxsvr”
  • Shutting down your virtual machine. Actually don’t do it. There isn’t actually anything wrong with shutting down your virtual machine, but there is seldom a point. Saving the machine state instead, will make it much faster to start up again the next time you want to use that particular virtual machine. You can do this by going to Machine -> Close… and choosing “Save the machine state.” Also be aware that it’s not necessary to exit a virtual machine in order to use another: you can run as many of them as you want, simultaneously.

1 If your website is running off a server (e.g. Apache HTTP server) on your host machine it is not necessary to set up shared folders since you should be accessing the website through the server and not directly from its folder. To see a website that is on a server, simply go to its IP address.

I personally use DesktopServer for my server needs. It is aimed at developing WordPress websites, but works just as well for regular sites. Websites hosted on DesktopServer are usually accessed from fictional “.dev” domain names, but from the program’s window it is possible to assign an IP address to a site. Following are the directions, originally written by Stephen Carroll at the ServerPress forums:

  1. From DesktopServer’s main list of options, select “Import, export or share…”
  2. Select “Share…”, followed by clicking the next button. You’ll then be presented with a list of sites.
  3. Select the website you wish to share and select the “LAN” option (please make a note of the IP Address).
  4. Be sure to click next to save your options and automatically restart the server. You will now be able to access your site via the IP address on both your local and remote computers and mobile devices on you LAN. 

A few more things…