Bobby
URL tested: http://thunder.nsstc.nasa.gov/primer/index.html, January 7, 2002 10:12:52 AM CST
Bobby Core v3.2, WAI Guidelines 1999/05/05

About this report

The Bobby report presents an accessibility evaluation grouped by the three priority levels defined by the Web Access Initiative (WAI), as well as browser compatibility and download statistics. As an automated evaluation tool, Bobby is able to detect many accessibility problems and to highlight other possible problems that must be checked. A "Bobby" hat in the original page (if displayed) indicates that Bobby was able to detect a Priority 1 problem with accessibility. A question mark indicates a Priority 1 item that needs to be checked by the user. Follow the links provided in the report to get details about any problem reported, including how to repair it, if needed. For more information on the report, please access our online documentation.

To be Bobby Approved, a page must pass all of the Priority 1 accessibility checkpoints established by the WAI.




Click on the error messages below to find out more information.

Priority 1 Accessibility

This web page does not contain any Priority 1 accessibility errors that Bobby can detect. However, certain items require human judgment; these are listed below. Please review these items; if none of these apply to your page, it qualifies for Bobby Approved status.

User Checks

User checks are triggered by something specific on the page; however, you need to determine whether they apply. Bobby Approval requires that none of them apply to your page. Please review these 5 item(s):

  1. If an image conveys important information beyond what is its alternative text, provide an extended description. (23 instances)
    Lines 89-90, Lines 91-93, Lines 94-95, Lines 96-98, Lines 99-100, Lines 101-102, Lines 103-104, Lines 105-106, Lines 107-108, Lines 109-110, Lines 111-112, Lines 113-114, Lines 115-116, Lines 121-122, Lines 123-124, Lines 125-126, Lines 130-131, Line 167, Lines 185-186, Lines 196-197, Lines 221-222, Line 240, Line 337
  2. If you use color to convey information, make sure the information is also represented another way.

  3. For tables not used for layout (for example, a spreadsheet), identify headers for the table rows and columns. (3 instances)
    Line 87, Line 158, Line 314
  4. If a table has two or more rows or columns that serve as headers, use structural markup to identify their hierarchy and relationship. (8 instances)
    Line 119, Line 87, Lines 139-141, Line 136, Line 161, Line 233, Line 158, Line 314
  5. Provide alternative content for each SCRIPT that conveys important information or functionality.

The following 4 item(s) are not triggered by any specific feature on your page, but are still important for accessibility and are required for Bobby Approved status.

  1. Ensure that descriptions of dynamic content are updated with changes in content.

  2. Use the simplest and most straightforward language that is possible.

  3. Avoid ASCII art.

  4. If you can't make a page accessible, construct an alternate accessible version.

If the Priority 1 issues listed do not apply to your page, then it qualifies as Bobby Approved and you are entitled to use the Bobby Approved icon. To obtain the icon and learn how to place it in your page, visit the Icon Guidelines page on the CAST web site.


Priority 2 Accessibility

Bobby Approved status is assigned on the basis of Priority 1 items in the Web Content Guidelines. For a higher level of accessibility you may also want to examine Priority 2 and Priority 3 items. 3 Priority 2 issue(s) that Bobby has identified are presented below.

  1. Avoid use of deprecated language features if possible. (57 instances)
    Line 86, Line 135, Line 144, Line 146, Line 156, Line 163, Line 168, Line 178, Line 185, Line 186, Line 196, Line 197, Line 205, Line 209, Line 214, Line 221, Line 222, Line 227, Line 235, Line 236, Line 240, Line 241, Line 248, Line 258, Line 264, Line 274, Line 279, Line 283, Line 289, Line 295, Line 305, Line 306, Line 312, Line 313, Line 321, Line 331, Line 332
  2. Use relative sizing and positioning (% values) rather than absolute (pixels). (22 instances)
    Line 87, Line 136, Line 158, Line 168, Line 178, Line 185, Line 196, Line 205, Line 209, Line 214, Line 221, Line 227, Line 241, Line 248, Line 258, Line 264, Line 274, Line 279, Line 283, Line 289, Line 295, Line 314
  3. Make sure event handlers do not require use of a mouse. (6 instances)
    Line 91, Line 96, Line 101, Line 105, Line 109, Line 113

User Checks

6 Priority 2 issue(s) that Bobby has identified are presented below:

  1. Mark up quotations with the Q and BLOCKQUOTE elements.

  2. Check that the foreground and background colors contrast sufficiently with each other.

  3. Avoid using movement in images where possible. (20 instances)
    Lines 89-90, Lines 91-93, Lines 94-95, Lines 96-98, Lines 99-100, Lines 101-102, Lines 103-104, Lines 105-106, Lines 107-108, Lines 109-110, Lines 111-112, Lines 113-114, Lines 115-116, Lines 121-122, Lines 123-124, Lines 125-126, Line 167, Lines 196-197, Line 240, Line 337
  4. If scripts create pop-up windows or change the active window, ensure that the user is aware this is happening. (8 instances)
    Line 10, Line 40, Line 50, Line 56, Line 62, Line 68, Line 74, Line 80
  5. Avoid using tables to format text documents in columns unless the table can be linearized. (8 instances)
    Line 119, Line 87, Lines 139-141, Line 136, Line 161, Line 233, Line 158, Line 314
  6. Add a descriptive title to links when needed.

The following 8 item(s) are not triggered by any specific feature on your page, but are still important for accessibility.

  1. Use a clear, consistent navigation structure.

  2. Make sure your document validates to formal published grammars.

  3. Where it's possible to mark up content (for example mathematical equations) instead of using images, use a markup language (such as MathML).

  4. Use metadata to add computer-understandable information about the page.

  5. Group related elements when possible.

  6. Ensure that dynamic content is accessible or provide an alternate presentation or page.

  7. Offer a site map or table of contents, and provide a description of the general layout of the site, the access features used, and how to use them.

  8. Use the latest technology specification available whenever possible.


Priority 3 Accessibility

Bobby Approved status is assigned on the basis of Priority 1 items in the Web Content Guidelines. For a higher level of accessibility you may also want to examine Priority 2 and Priority 3 items. 2 Priority 3 issue(s) that Bobby has identified are presented below.

  1. Identify the language of the text. (1 instance)
    Line 1
  2. Provide a summary and caption for tables. (8 instances)
    Line 119, Line 87, Lines 139-141, Line 136, Line 161, Line 233, Line 158, Line 314

User Checks

4 Priority 3 issue(s) that Bobby has identified are presented below:

  1. Provide abbreviations for long row or column labels. (8 instances)
    Line 119, Line 87, Lines 139-141, Line 136, Line 161, Line 233, Line 158, Line 314
  2. Specify a logical tab order among form controls, links and objects.

  3. Consider adding keyboard shortcuts to frequently used links.

  4. Provided a linear text alternative for tables that lay out content in parallel, word-wrapped columns. (8 instances)
    Line 87, Line 119, Line 136, Lines 139-141, Line 158, Line 161, Line 233, Line 314

The following 9 item(s) are not triggered by any specific feature on your page, but are still important for accessibility.

  1. Create a consistent style of presentation between pages.

  2. Provide a link at the beginning of a group of related links to bypass the group.

  3. Use icons or graphics (with accessible alternatives) to facilitate comprehension of the page.

  4. Allow users to customize their experience of the web page.

  5. Use the ABBR and ACRONYM elements to denote and expand abbreviations and acronyms.

  6. Offer navigation bars for easy access to the navigation structure.

  7. Place distinguishing information at the beginning of headings, paragraphs, lists, etc.

  8. If ASCII art is present, provide a means to skip over it.

  9. Offer different types of searches for different skill levels and preferences.


Browser Compatibility Errors

The following section contains a list of 15 browser compatibility errors. Browser compatibility errors help to determine when HTML tags and their attributes are not compatible with certain web browsers or HTML specifications. Browser compatibility errors do not affect the accessibility rating of a page.
  1. Unknown attribute VSPACE in element IMG. for browser(s): Lynx2.7 (5 instances)
    Line 167, Lines 185-186, Lines 196-197, Lines 221-222, Line 240
  2. Attribute ALINK in element BODY needs a valid color. for browser(s): Explorer4.01, Navigator4.0 (1 instance)
    Line 7
  3. Unknown attribute BORDERCOLOR in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 139-141
  4. Unknown attribute NAME in element IMG. for browser(s): Lynx2.7 (1 instance)
    Lines 123-124
  5. Unknown attribute WIDTH in element TD. for browser(s): Lynx2.7 (4 instances)
    Line 143, Line 144, Line 146, Line 331
  6. Attribute NOSHADE in element HR is assigned an incorrect value. for browser(s): Lynx2.7 (2 instances)
    Line 317, Line 327
  7. Attribute SIZE in element FONT must be assigned an integer. for browser(s): Explorer4.01 (1 instance)
    Line 305
  8. Unknown attribute BGCOLOR in element TABLE. for browser(s): Lynx2.7 (4 instances)
    Line 136, Lines 139-141, Line 161, Line 233
  9. Required attribute TYPE is missing from tag SCRIPT for browser(s): HTML4.0 (8 instances)
    Line 10, Line 40, Line 50, Line 56, Line 62, Line 68, Line 74, Line 80
  10. Unknown attribute BORDERCOLORLIGHT in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 139-141
  11. Unknown attribute BORDERCOLORDARK in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 139-141
  12. Unknown attribute COLS in element TABLE. for browser(s): HTML4.0 (1 instance)
    Lines 139-141
  13. Unknown attribute HSPACE in element IMG. for browser(s): Lynx2.7 (5 instances)
    Line 167, Lines 185-186, Lines 196-197, Lines 221-222, Line 240
  14. Unknown attribute BGCOLOR in element TD. for browser(s): Lynx2.7 (3 instances)
    Line 143, Line 144, Line 146
  15. Unknown attribute ALIGH in element DIV. for browser(s): Lynx2.7, Explorer4.01, Navigator4.0, HTML4.0 (2 instances)
    Line 86, Line 135

Download Time

The following three-column table gives download time statistics for the images, applets, and objects on this page. The first column contains the URL of each item, the second column the item size in kilobytes, and the third column the approximate download time for each item when using a 28,800 baud modem. At the end of the report, an arbitrary delay of 0.5 seconds is added for each file to account for slow-downs caused by HTTP connection times.

URL
Size
Time (secs)
http://thunder.nsstc.nasa.gov/primer/index.html 20.92 K 5.81
http://thunder.nsstc.nasa.gov/images/tabs/listab_back_left.gif 0.36 K 0.10
http://thunder.nsstc.nasa.gov/images/tabs/listab_back_home.gif 0.44 K 0.12
http://thunder.nsstc.nasa.gov/images/tabs/listab_front_middle1.gif 0.38 K 0.11
http://thunder.nsstc.nasa.gov/images/tabs/listab_front_primer.gif 0.50 K 0.14
http://thunder.nsstc.nasa.gov/images/tabs/listab_front_middle2.gif 0.39 K 0.11
http://thunder.nsstc.nasa.gov/images/tabs/listab_back_dataset.gif 0.64 K 0.18
http://thunder.nsstc.nasa.gov/images/tabs/listab_back_middle2.gif 0.38 K 0.10
http://thunder.nsstc.nasa.gov/images/tabs/listab_back_research.gif 0.96 K 0.27
http://thunder.nsstc.nasa.gov/images/tabs/listab_back_validation.gif 0.57 K 0.16
http://thunder.nsstc.nasa.gov/images/tabs/listab_back_bookshelf.gif 0.58 K 0.16
http://thunder.nsstc.nasa.gov/images/tabs/listab_back_right.gif 0.36 K 0.10
http://thunder.nsstc.nasa.gov/images/desc/desc_spacer_left.gif 0.16 K 0.04
http://thunder.nsstc.nasa.gov/images/desc/desc_spacer_middle.gif 0.18 K 0.05
http://thunder.nsstc.nasa.gov/images/desc/desc_spacer_right.gif 0.16 K 0.04
http://thunder.nsstc.nasa.gov/images/titles/titles_primer.jpg 13.26 K 3.68
http://thunder.nsstc.nasa.gov/images/primer/thunderbird.gif 4.60 K 1.28
http://thunder.nsstc.nasa.gov/images/primer/apollo12.jpg 7.52 K 2.09
http://thunder.nsstc.nasa.gov/images/primer/alpha_centaur.gif 0.98 K 0.27
http://thunder.nsstc.nasa.gov/images/primer/buildings.jpg 5.48 K 1.52
http://thunder.nsstc.nasa.gov/images/primer/ben.gif 3.94 K 1.09
http://thunder.nsstc.nasa.gov/images/fullwhite.gif 3.34 K 0.93
Total
66.07 K
18.35
HTTP Request Delays
--
11.00
Total + Delays
--
29.35