Checklist

The purpose of each input field collecting information about the user can be programmatically determined when:

• The input field serves a purpose identified in the Input Purposes for User Interface Components section; and
  
• The content is implemented using technologies with support for identifying the expected meaning for form input data.

Content can be presented without loss of information or functionality, and without requiring scrolling in two dimensions for:

• Vertical scrolling content at a width equivalent to 320 CSS pixels;
  
• Horizontal scrolling content at a height equivalent to 256 CSS pixels.
  

Except for parts of the content which require two-dimensional layout for usage or meaning.

Where receiving and then removing pointer hover or keyboard focus triggers additional content to become visible and then hidden, the following are true:

• Dismissable
  A mechanism is available to dismiss the additional content without moving pointer hover or keyboard focus, unless the additional content communicates an input error or does not obscure or replace other content;

• Hoverable
  If pointer hover can trigger the additional content, then the pointer can be moved over the additional content without the additional content disappearing;

• Persistent
  The additional content remains visible until the hover or focus trigger is removed, the user dismisses it, or its information is no longer valid.
  

Exception: The visual presentation of the additional content is controlled by the user agent and is not modified by the author.