Bobby
URL tested: http://thunder.nsstc.nasa.gov/bookshelf/, January 7, 2002 9:56:12 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. (57 instances)
    Lines 65-66, Lines 67-69, Lines 70-71, Lines 72-74, Lines 75-76, Lines 77-78, Lines 79-80, Lines 81-82, Lines 83-84, Lines 85-86, Lines 87-88, Lines 89-90, Lines 91-92, Lines 97-98, Lines 99-100, Lines 101-102, Lines 106-107, Lines 178-180, Line 182, Line 194, Lines 212-214, Lines 230-232, Line 252, Line 268, Line 284, Line 300, Line 316, Line 332, Line 344, Line 346, Line 348, Lines 364-366, Line 367, Lines 373-375, Line 382, Line 392, Line 403, Line 413, Line 425, Line 435, Line 444, Line 456, Line 466, Line 478, Line 486, Line 494, Line 502, Line 510, Line 521, Line 528, Line 529, Line 530, Line 565, Line 575, Line 585, Line 597, Line 642
  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. (6 instances)
    Line 63, Line 167, Line 358, Line 561, Line 537, Line 619
  4. If a table has two or more rows or columns that serve as headers, use structural markup to identify their hierarchy and relationship. (11 instances)
    Line 95, Line 63, Lines 119-123, Line 115, Line 143, Line 167, Line 358, Line 543, Line 561, Line 537, Line 619
  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. (66 instances)
    Line 62, Line 111, Line 141, Line 149, Line 155, Line 171, Line 196, Line 198, Line 216, Line 234, Line 236, Line 254, Line 255, Line 270, Line 271, Line 286, Line 287, Line 302, Line 303, Line 318, Line 319, Line 334, Line 335, Line 360, Line 376, Line 383, Lines 393-395, Line 395, Lines 404-406, Line 406, Lines 414-416, Line 416, Line 418, Line 426, Line 428, Line 436, Line 438, Lines 445-447, Line 447, Line 448, Line 449, Lines 457-459, Line 459, Lines 467-469, Line 469, Line 479, Line 487, Line 495, Line 503, Line 512, Line 514, Line 522, Line 524, Line 547, Line 567, Line 577, Line 587, Line 599, Line 618, Line 626, Line 636, Line 637
  2. Use relative sizing and positioning (% values) rather than absolute (pixels). (137 instances)
    Line 63, Line 115, Line 143, Line 167, Line 171, Line 178, Line 182, Line 184, Line 190, Line 192, Line 194, Line 196, Line 208, Line 210, Line 212, Line 216, Line 226, Line 228, Line 230, Line 234, Line 248, Line 250, Line 252, Line 254, Line 264, Line 266, Line 268, Line 270, Line 280, Line 282, Line 284, Line 286, Line 296, Line 298, Line 300, Line 302, Line 312, Line 314, Line 316, Line 318, Line 328, Line 330, Line 332, Line 334, Line 344, Line 346, Line 348, Line 350, Line 358, Line 360, Line 364, Line 367, Line 368, Line 371, Line 372, Line 373, Line 376, Line 380, Line 381, Line 382, Line 383, Line 390, Line 391, Line 392, Line 393, Line 401, Line 402, Line 403, Line 404, Line 411, Line 412, Line 413, Line 414, Line 423, Line 424, Line 425, Line 426, Line 433, Line 434, Line 435, Line 436, Line 442, Line 443, Line 444, Line 445, Line 454, Line 455, Line 456, Line 457, Line 464, Line 465, Line 466, Line 467, Line 476, Line 477, Line 478, Line 479, Line 484, Line 485, Line 486, Line 487, Line 492, Line 493, Line 494, Line 495, Line 500, Line 501, Line 502, Line 503, Line 508, Line 509, Line 510, Line 511, Line 519, Line 520, Line 521, Line 522, Line 528, Line 529, Line 530, Line 531, Line 537, Line 561, Line 565, Line 567, Line 575, Line 577, Line 585, Line 587, Line 597, Line 599, Line 619
  3. Make sure event handlers do not require use of a mouse. (31 instances)
    Line 67, Line 72, Line 77, Line 81, Line 85, Line 89, Line 194, Line 212, Line 230, Line 252, Line 268, Line 284, Line 300, Line 316, Line 332, Line 373, Line 382, Line 392, Line 403, Line 413, Line 425, Line 435, Line 444, Line 456, Line 466, Line 478, Line 486, Line 494, Line 502, Line 510, Line 521

User Checks

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

  1. Create link phrases that make sense when read out of context. (1 instance)
    Line 591
  2. Mark up quotations with the Q and BLOCKQUOTE elements.

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

  4. Avoid using movement in images where possible. (58 instances)
    Lines 65-66, Lines 67-69, Lines 70-71, Lines 72-74, Lines 75-76, Lines 77-78, Lines 79-80, Lines 81-82, Lines 83-84, Lines 85-86, Lines 87-88, Lines 89-90, Lines 91-92, Lines 97-98, Lines 99-100, Lines 101-102, Lines 178-180, Line 182, Line 194, Lines 212-214, Lines 230-232, Line 252, Line 268, Line 284, Line 300, Line 316, Line 332, Line 344, Line 346, Line 348, Line 350, Lines 364-366, Line 367, Lines 373-375, Line 382, Line 392, Line 403, Line 413, Line 425, Line 435, Line 444, Line 456, Line 466, Line 478, Line 486, Line 494, Line 502, Line 510, Line 521, Line 528, Line 529, Line 530, Line 531, Line 565, Line 575, Line 585, Line 597, Line 642
  5. If scripts create pop-up windows or change the active window, ensure that the user is aware this is happening. (2 instances)
    Line 6, Line 35
  6. Avoid using tables to format text documents in columns unless the table can be linearized. (11 instances)
    Line 95, Line 63, Lines 119-123, Line 115, Line 143, Line 167, Line 358, Line 543, Line 561, Line 537, Line 619
  7. 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. (11 instances)
    Line 95, Line 63, Lines 119-123, Line 115, Line 143, Line 167, Line 358, Line 543, Line 561, Line 537, Line 619

User Checks

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

  1. Provide abbreviations for long row or column labels. (11 instances)
    Line 95, Line 63, Lines 119-123, Line 115, Line 143, Line 167, Line 358, Line 543, Line 561, Line 537, Line 619
  2. Specify a logical tab order among form controls, links and objects.

  3. Consider adding keyboard shortcuts to frequently used links.

  4. Group related links.

  5. Provided a linear text alternative for tables that lay out content in parallel, word-wrapped columns. (11 instances)
    Line 63, Line 95, Line 115, Lines 119-123, Line 143, Line 167, Line 358, Line 537, Line 543, Line 561, Line 619

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 16 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 ALIGH in element DIV. for browser(s): Lynx2.7, Explorer4.01, Navigator4.0, HTML4.0 (2 instances)
    Line 62, Line 111
  2. Attribute ALINK in element BODY needs a valid color. for browser(s): Explorer4.01, Navigator4.0 (1 instance)
    Line 33
  3. Unknown attribute BORDERCOLOR in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 119-123
  4. Unknown attribute BGCOLOR in element TR. for browser(s): Lynx2.7 (4 instances)
    Line 563, Line 573, Line 583, Line 595
  5. Unknown attribute NAME in element IMG. for browser(s): Lynx2.7 (32 instances)
    Lines 67-69, Lines 72-74, Lines 77-78, Lines 81-82, Lines 85-86, Lines 89-90, Lines 99-100, Line 194, Lines 212-214, Lines 230-232, Line 252, Line 268, Line 284, Line 300, Line 316, Line 332, Lines 373-375, Line 382, Line 392, Line 403, Line 413, Line 425, Line 435, Line 444, Line 456, Line 466, Line 478, Line 486, Line 494, Line 502, Line 510, Line 521
  6. Unknown attribute WIDTH in element TD. for browser(s): Lynx2.7 (126 instances)
    Line 171, Line 178, Line 182, Line 184, Line 190, Line 192, Line 194, Line 196, Line 208, Line 210, Line 212, Line 216, Line 226, Line 228, Line 230, Line 234, Line 248, Line 250, Line 252, Line 254, Line 264, Line 266, Line 268, Line 270, Line 280, Line 282, Line 284, Line 286, Line 296, Line 298, Line 300, Line 302, Line 312, Line 314, Line 316, Line 318, Line 328, Line 330, Line 332, Line 334, Line 344, Line 346, Line 348, Line 350, Line 360, Line 364, Line 367, Line 368, Line 371, Line 372, Line 373, Line 376, Line 380, Line 381, Line 382, Line 383, Line 390, Line 391, Line 392, Line 393, Line 401, Line 402, Line 403, Line 404, Line 411, Line 412, Line 413, Line 414, Line 423, Line 424, Line 425, Line 426, Line 433, Line 434, Line 435, Line 436, Line 442, Line 443, Line 444, Line 445, Line 454, Line 455, Line 456, Line 457, Line 464, Line 465, Line 466, Line 467, Line 476, Line 477, Line 478, Line 479, Line 484, Line 485, Line 486, Line 487, Line 492, Line 493, Line 494, Line 495, Line 500, Line 501, Line 502, Line 503, Line 508, Line 509, Line 510, Line 511, Line 519, Line 520, Line 521, Line 522, Line 528, Line 529, Line 530, Line 531, Line 547, Line 565, Line 567, Line 575, Line 577, Line 585, Line 587, Line 597, Line 599, Line 636
  7. Attribute NOSHADE in element HR is assigned an incorrect value. for browser(s): Lynx2.7 (2 instances)
    Line 622, Line 632
  8. Unknown attribute BACKGROUND in element TD. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (76 instances)
    Line 178, Line 190, Line 192, Line 194, Line 208, Line 210, Line 212, Line 226, Line 228, Line 230, Line 248, Line 250, Line 252, Line 264, Line 266, Line 268, Line 280, Line 282, Line 284, Line 296, Line 298, Line 300, Line 312, Line 314, Line 316, Line 328, Line 330, Line 332, Line 364, Line 371, Line 372, Line 373, Line 380, Line 381, Line 382, Line 390, Line 391, Line 392, Line 401, Line 402, Line 403, Line 411, Line 412, Line 413, Line 423, Line 424, Line 425, Line 433, Line 434, Line 435, Line 442, Line 443, Line 444, Line 454, Line 455, Line 456, Line 464, Line 465, Line 466, Line 476, Line 477, Line 478, Line 484, Line 485, Line 486, Line 492, Line 493, Line 494, Line 500, Line 501, Line 502, Line 508, Line 509, Line 510, Line 520, Line 521
  9. Attribute SIZE in element FONT must be assigned an integer. for browser(s): Explorer4.01 (2 instances)
    Line 171, Line 360
  10. Unknown attribute BGCOLOR in element TABLE. for browser(s): Lynx2.7 (3 instances)
    Line 115, Lines 119-123, Line 537
  11. Required attribute TYPE is missing from tag SCRIPT for browser(s): HTML4.0 (2 instances)
    Line 6, Line 35
  12. Unknown attribute BORDERCOLORLIGHT in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 119-123
  13. Unknown attribute BORDERCOLORDARK in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 119-123
  14. Unknown attribute COLS in element TABLE. for browser(s): HTML4.0 (1 instance)
    Lines 119-123
  15. Unknown attribute BGCOLOR in element TD. for browser(s): Lynx2.7 (3 instances)
    Line 127, Line 171, Line 360
  16. Unknown attribute HEIGHT in element TD. for browser(s): Lynx2.7 (5 instances)
    Line 190, Line 192, Line 194, Line 196, Line 382

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/bookshelf/ 33.81 K 9.39
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_back_middle2.gif 0.38 K 0.10
http://thunder.nsstc.nasa.gov/images/tabs/listab_back_primer.gif 0.44 K 0.12
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_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_front_middle1.gif 0.38 K 0.11
http://thunder.nsstc.nasa.gov/images/tabs/listab_front_bookshelf.gif 0.65 K 0.18
http://thunder.nsstc.nasa.gov/images/tabs/listab_front_right.gif 0.38 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_bookshelf.jpg 12.03 K 3.34
http://thunder.nsstc.nasa.gov/images/icons/data_icon_folder.gif 0.39 K 0.11
http://thunder.nsstc.nasa.gov/images/blank_spacer.gif 0.08 K 0.02
http://thunder.nsstc.nasa.gov/images/icons/data_icon_html-1.gif 0.70 K 0.19
http://thunder.nsstc.nasa.gov/images/icons/data_icon_pdf-1.gif 0.36 K 0.10
http://thunder.nsstc.nasa.gov/images/icons/data_icon_binary-1.gif 0.31 K 0.09
http://thunder.nsstc.nasa.gov/images/icons/data_icon_txt-1.gif 0.57 K 0.16
http://thunder.nsstc.nasa.gov/images/fullwhite.gif 3.34 K 0.93
Total
57.27 K
15.91
HTTP Request Delays
--
11.00
Total + Delays
--
26.91