Horizon/WebAccessibility

We inspected the Horizon (Havana release) for web accessibility and found the following problems.

• 1.1.1 Non-text Contents
  • A few non-text contents such as Network Topology (for Neutron) and Resource Usage (for Ceilometer) have no text alternatives.

• 1.3.1 Info and Relationships
  • There is no caption element, summary attribute in tables such as instances, volumes, images, so on.
  • There is no scope attribute in th elements.

• 1.4.3 Contrast (Minimum)
  • text color and background color in the left menu
  • text color and background color in the top menu
  • link color and background color in the main content area
  • text color and background color of the some buttons

• 2.1.1 Keyboard
  • It's not easy to handle the layered message window by keyboard only.
  • It may be difficult for a blind person to notice this layered error message.

• 2.4.1 Bypass Blocks
  • There is no mechanism to skip repeated contents such as menu. For example, we can add a link at the top of each page that goes directly to the main content area.

• 2.4.3 Focus Order
  • The order of navigation doesn't match the visual order in some cases.
  • The focus movement is not restricted to the layered pop-up window.

• 3.1.1 Language of Page
  • There is no lang attribute on the html element.

• 3.3.2 Labels or Instructions
  • Is it better to use label element to associate text labels with input elements?