2.2.44 [HTML] Section 17.11.1, Tabbing navigation

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V0117:

The specification states:

 tabindex = number [CN] 
  
 This attribute specifies the position of the current element in the tabbing order 
 for the current document. This value must be a number between 0 and 32767.

All Document Modes (All Versions)

The value can be a number less than 0 or greater than 32767. If the value is less than 0 or greater than 32767, the element is excluded from the tab cycle of the document.

The upper bound for the value of the tabindex attribute is 32768.

C0039:

The specification states:

 Tabbing keys. The actual key sequence that causes tabbing navigation or element 
 activation depends on the configuration of the user agent (e.g., the "tab" key is 
 used for navigation and the "enter" key is used to activate a selected element).

All Document Modes (All Versions)

The TAB key is used to navigate between elements and the SPACEBAR is used to activate buttons and input controls. The ENTER key is used to submit a form or navigate a hyperlink or area. For controls like textarea, the ENTER key and SPACEBAR have special behaviors such as adding a new line or a space, respectively.

C0040:

The specification states:

 User agents may also define key sequences to navigate the tabbing order in reverse. 
 When the end (or beginning) of the tabbing order is reached, user agents may circle 
 back to the beginning (or end).

All Document Modes (All Versions)

Pressing SHIFT+TAB navigates the tabbing order in reverse. When the beginning of the tabbing order is reached, the tab placement cycles back to the end. Controls such as the Address bar and search box participate in the tab sequence and represent the first elements to receive focus upon cycling back to the end.