A blog article by Kady O'Malley about a new feature on the parliamentary website suggests that rather than moving towards Internet standards that the parliamentary IT folks are moving to being more software vendor dependant.
In this case it was a new "View this Video" feature only being available under Microsoft's Internet Explorer. There is an ugly hack called IETab which allows Internet Explorer to run within Firefox or Chrome, but that still requires the use of a specific brand of browser that only runs on a single historically popular operating system.
The popularity of an operating system or device at any moment in time should not be considered relevant to new features on the parliamentary website. At one time the Liberals held a majority, and by the logic of suggesting that having a majority once means that things should be mandated forever we should be mandating that only Liberal party members be able to access new features on the parliamentary website.