The Assessment Plus website conforms to web standards created by the World Wide Web Consortium. As a result its pages load faster, are more easily machine-readable and more widely accessible than non-standard documents.
However, adherence to these standards means that the website's formatting is not compatible with certain older web browsers - and if you are reading this, it is quite likely that you are currently using an incompatible browser. The Assessment Plus website is still perfectly usable when viewed with such software; all that is disabled is the graphical layout of its pages.
The home page in a compatible browser:

We recommend you use a standards-compatible browser.
Despite the fact that all information on standards-based sites should be available to users of older software, we recommend that you upgrade if you are using an older browser. Aside from improved rendering of pages, modern browsers are more secure, reliable and user-friendly than previous versions.
We recommend that you search for an updated version of your current browser - nearly every major browser is completely free to download.