This disclosure relates to analysing an electronic document and has particular application to analysing webpages. Where the electronic document is in the form of a webpage, it is highly desirable to test the webpage to ensure the integrity of key characteristics of the webpage remain in place after changes or updates are made to the webpage, such as user click through links and analytic tags and to ensure that any changes to a webpage do not result in broken links to other pages and that analytic tags are not adversely impacted by changes to the webpage that could cause the tags to send inaccurate or incomplete analytic data to the analytics engine.