Accessibility Information - Tableau

We sometimes publish and link to visual data using Tableau (external website). This information is hosted on an external website and we make our information as accessible as the platform allows.

We are aware that the Tableau dashboards have multiple accessibility issues and are partially compliant with WCAG 2.1 AA. Issues that we are aware of include, but are not limited to:

  • Images do not have alt-text or inaccurate alt-text, failing WCAG 2.1 success criterion 1.1.1 Non-text Content
  • Pages do not have top-level headings, failing WCAG 2.1 success criterion 1.3.1 Info and Relationships
  • Some headings don’t include text, failing WCAG 2.1 success criterion 1.3.1 Info and Relationships
  • Pages have HTML that is not in a meaningful sequence, failing WCAG 2.1 success criterion 1.3.2 Meaningful Sequence
  • Some text does not have sufficient contrast, failing WCAG 2.1 success criterion 1.4.3 Contrast (minimum)
  • Elements in pages are not available to keyboard users, failing WCAG 2.1 success criterion 2.1.1 Keyboard
  • Pages do not provide a way to skip to the main content of the page, failing WCAG 2.1 success criterion 2.4.1 Bypass Blocks
  • Pages do not have appropriate titles, failing WCAG 2.1 success criterion 2.4.2 Page Titled
  • Links do not have appropriate link text and no alt-text, failing WCAG 2.1 success criterion 2.4.4 Link Purpose (In Context)
  • Some pages have duplicate IDs and accessible technologies like screen readers can fail to read out the correct text, or may read out no text at all, failing WCAG 2.1 success criterion 4.1.1 Parsing
  • Some pages have links that cannot be read by screen readers, failing WCAG 2.1 success criterion 4.1.2 Name, Role, Value

Tests were conducted on 13 Tableau dashboards using a mixture of automated tests using Silktide and manual tests using NVDA screen reader.

We are committed to ensuring that all GMCA dashboards are as accessible as possible.  The GMCA Research Team is reviewing the issues identified above, to identify an agreed approach and timeline to improve accessibility. This will be implemented in line with the update cycle for the dashboards.