Web Development and Design Foundations with XHTML, 5th Edition

(^642) Answers

Chapter 6

Checkpoint 6.1

1. Answers will vary. They could include the following: ease of site maintenance,
   separation of style from structure, increased accessibility, support of the Semantic
   Web, smaller documents, increased page layout control, support of multiple
   media types, and greater typography control.


2. Relative positioning allows you to alter the position of an element in relation to
   where it would otherwise be displayed using normal flow. Absolute positioning
   allows you to specify by pixels the exact location of an element in a Web page.


3. The z-indexproperty provides flexibility in the display of elements. When using
   XHTML only there is no easy way to “stack” elements other than configuring
   backgrounds for pages or tables. The z-indexproperty configures the stacking
   order of elements on a Web page. The default z-indexvalue is 0. Elements
   with higher z-indexvalues will appear stacked on top of elements with lower
   z-indexvalues rendered on the same position of the page.

Checkpoint 6.2

1. The page layout is liquid. Attributes of liquid page design include the following:
   pages take up 100 percent of the browser window—there is no blank margin on the
   left or right side of the page. The middle area expands and contracts when the page
   is resized. The content flows to fill whatever size window is used to display it.


2. Answers will vary. Some of the suggestions listed in the debugging section may be
   used.


3. Configure the XHTML tag as a selector if the style is expected to be applied
   every time that tag is used. Configure an id if the style is for a specific element
   that is expected to occur only once on a page. Configure a class if the style is
   expected to be applied to a variety of different XHTML elements.

Review Questions

15. Student answers will vary. The four
    principles that are essential to com-
    plying with WCAG 2.0 are as fol-
    lows: Perceivable, Operable,
    Understandable, and Robust.
    
    
    1. Content must be Perceivable
    
    
    2. Interface components in the
       content must be Operable
       3. Content and controls must be
       Understandable
       4. Content should be Robust
       enough to work with current
       and future user agents, includ-
       ing assistive technologies
    
    
    
    


16. a


17. a


18. b


19. b


20. d


21. c


22. c


23. b