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Browser Support

Stan -

Browser Support

This standard applies to web browsers that are being used on Windows, Mac OS, iOS and Android.

Web Browser Support

We accept that the nature of the web medium is such that web pages cannot be produced in such a way as to be uniformly rendered in all browsers, so as to provide a consistent experience for all users. We accept that small variations in this experience are acceptable within the 'Levels of Support'.

Publicly visible pages and admin only pages have different levels of browser support. Web browsers are assigned a 'Level of Support,' these levels of support are summarised in the Browser Support Tables below.

'Levels of Support' definitions

Support Level 1 - supported web browser - Support definition

  • All content MUST be readable and usable and all functionality MUST work.
  • Variations to presentation of content MUST be minimised.
  • Where CSS layout is used, the CSS MUST be rendered by supported web browsers, so that a fully-styled version of the page is presented to the user.
  • Variations between browsers are inevitable. In these situations, when deciding which browsers should offer a better experience than other browsers (i.e. which would be the closest to the original design), you MUST base your decision on which outcome would maximise the value for money for the client.
  • Pages SHOULD be developed to maximise the user experience for users of the web browser with the highest proportion of users.

Support Level 2 - partially-supported web browser - Support definition:

  • All core content MUST be readable and usable and navigation MUST work.
  • Any degradation to (client-side) application functionality MUST be graceful degradation.
  • Any degradation to presentation MUST NOT obscure content.
  • Where CSS layout is used, you MAY choose to provide an unstyled version of the page to partially-supported browser.

Support Level 3 - unsupported web browser - Support definition:

  • No support or testing necessary.
  • Any web browsers not specifically listed in the support table MAY be regarded as level 3; that is, unsupported.

Support tables

The tables below define the levels of support that MUST be adhered to.

Publicly visible pages

Browser Internet Explorer Firefox Chrome Safari Android Browser
Platform Windows Windows & macOS Windows, macOS & Android macOS & iOS Android
Level 1 11 Latest (Firefox is self-updating) Latest (Chrome is self-updating) Latest  
Level 2 10       Android 4.x & Android 5.x
Level 3  9        

Admin pages

Browser Internet Explorer Firefox Chrome Safari
Platform Windows Windows & macOS Windows & macOS macOS
Level 1 11 Latest (Firefox is self-updating) Latest (Chrome is self-updating) Latest
Level 2 10      
Level 3  9      

Internet Explorer 7, 8, 9 and 10

Internet Explorer 7, 8, 9 and 10 are no longer supported by Microsoft after Jan 12th 2016. See

At August 2017 we continue to provide some support for Internet Explorer 10 as our usage statistics show that this browser continues to be used. Usage of older Internet Explorer browsers is falling rapidly as people switch to browsers that are more modern, secure and supported.  We will stop supporting Internet Explorer 10 at the end of 2017.

Microsoft stipulate that Internet Explorer 10 is end-of-life and should not be used. 


Browser Versions: Pre v1.0, Alpha, Beta and Release Candidate builds are not supported.