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. (43 instances)
    Lines 40-41, Lines 42-44, Lines 45-46, Lines 47-49, Lines 50-51, Lines 52-53, Lines 54-55, Lines 56-57, Lines 58-59, Lines 60-61, Lines 62-63, Lines 64-65, Lines 66-67, Lines 72-73, Lines 74-75, Lines 76-77, Lines 81-82, Line 107, Line 109, Line 249, Lines 322-323, Lines 342-343, Lines 363-364, Lines 385-386, Lines 405-406, Lines 433-434, Lines 450-451, Lines 468-469, Lines 484-485, Lines 512-513, Lines 530-531, Lines 546-547, Lines 562-563, Lines 586-587, Lines 609-610, Lines 628-629, Lines 644-645, Lines 659-660, Lines 683-684, Lines 699-700, Lines 715-716, Lines 733-734, Line 776
  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. (7 instances)
    Line 38, Line 424, Line 508, Line 582, Line 679, Line 101, Line 753
  4. If a table has two or more rows or columns that serve as headers, use structural markup to identify their hierarchy and relationship. (6 instances)
    Line 70, Line 38, Lines 90-92, Line 88, Line 101, Line 753
  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. (64 instances)
    Line 37, Line 86, Line 94, Line 122, Line 124, Line 136, Line 140, Line 144, Line 147, Line 152, Line 156, Line 162, Line 166, Line 170, Line 180, Line 193, Line 208, Line 218, Line 230, Line 244, Line 246, Line 248, Line 249, Line 252, Line 254, Line 275, Line 278, Line 282, Line 285, Line 290, Line 293, Line 297, Line 313, Line 314, Line 315, Lines 325-326, Lines 346-347, Lines 367-368, Lines 389-390, Lines 409-410, Lines 437-438, Lines 454-455, Lines 471-472, Lines 488-489, Lines 516-517, Lines 534-535, Lines 550-551, Lines 566-567, Lines 590-591, Lines 613-614, Lines 632-633, Lines 648-649, Lines 663-664, Lines 687-688, Lines 703-704, Lines 719-720, Lines 737-738, Line 750, Line 752, Line 760, Line 770, Line 771
  2. Use relative sizing and positioning (% values) rather than absolute (pixels). (94 instances)
    Line 38, Line 88, Line 101, Line 122, Line 314, Line 315, Line 321, Line 324, Line 325, Line 336, Line 341, Line 345, Line 346, Line 357, Line 362, Line 366, Line 367, Line 379, Line 384, Line 388, Line 389, Line 399, Line 404, Line 408, Line 409, Line 427, Line 432, Line 436, Line 437, Line 444, Line 449, Line 453, Line 454, Line 462, Line 467, Line 470, Line 471, Line 478, Line 483, Line 487, Line 488, Line 498, Line 511, Line 515, Line 516, Line 524, Line 529, Line 533, Line 534, Line 540, Line 545, Line 549, Line 550, Line 556, Line 561, Line 565, Line 566, Line 572, Line 585, Line 589, Line 590, Line 603, Line 608, Line 612, Line 613, Line 622, Line 627, Line 631, Line 632, Line 638, Line 643, Line 647, Line 648, Line 653, Line 658, Line 662, Line 663, Line 669, Line 682, Line 686, Line 687, Line 693, Line 698, Line 702, Line 703, Line 709, Line 714, Line 718, Line 719, Line 727, Line 732, Line 736, Line 737, Line 753
  3. Make sure event handlers do not require use of a mouse. (6 instances)
    Line 42, Line 47, Line 52, Line 56, Line 60, Line 64

User Checks

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

  1. If a table is used for layout only, do not use structural markup to achieve formatting effects. (1 instance)
    Line 309
  2. Mark up quotations with the Q and BLOCKQUOTE elements.

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

  4. Use header elements in the proper sequence and not for bold text.

  5. Avoid using movement in images where possible. (42 instances)
    Lines 40-41, Lines 42-44, Lines 45-46, Lines 47-49, Lines 50-51, Lines 52-53, Lines 54-55, Lines 56-57, Lines 58-59, Lines 60-61, Lines 62-63, Lines 64-65, Lines 66-67, Lines 72-73, Lines 74-75, Lines 76-77, Line 107, Line 109, Line 249, Lines 322-323, Lines 342-343, Lines 363-364, Lines 385-386, Lines 405-406, Lines 433-434, Lines 450-451, Lines 468-469, Lines 484-485, Lines 512-513, Lines 530-531, Lines 546-547, Lines 562-563, Lines 586-587, Lines 609-610, Lines 628-629, Lines 644-645, Lines 659-660, Lines 683-684, Lines 699-700, Lines 715-716, Lines 733-734, Line 776
  6. Avoid using tables to format text documents in columns unless the table can be linearized. (6 instances)
    Line 70, Line 38, Lines 90-92, Line 88, Line 101, Line 753
  7. If scripts create pop-up windows or change the active window, ensure that the user is aware this is happening. (1 instance)
    Line 10
  8. 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. (13 instances)
    Line 70, Line 38, Lines 90-92, Line 88, Line 104, Line 118, Line 309, Line 424, Line 508, Line 582, Line 679, Line 101, Line 753

User Checks

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

  1. Provide abbreviations for long row or column labels. (13 instances)
    Line 70, Line 38, Lines 90-92, Line 88, Line 104, Line 118, Line 309, Line 424, Line 508, Line 582, Line 679, Line 101, Line 753
  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. (13 instances)
    Line 38, Line 70, Line 88, Lines 90-92, Line 101, Line 104, Line 118, Line 309, Line 424, Line 508, Line 582, Line 679, Line 753

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 COLUMNS in element TABLE. for browser(s): Lynx2.7, Explorer4.01, Navigator4.0, HTML4.0 (5 instances)
    Line 309, Line 424, Line 508, Line 582, Line 679
  2. Unknown attribute ALIGH in element DIV. for browser(s): Lynx2.7, Explorer4.01, Navigator4.0, HTML4.0 (1 instance)
    Line 37
  3. Attribute ALINK in element BODY needs a valid color. for browser(s): Explorer4.01, Navigator4.0 (1 instance)
    Line 7
  4. Unknown attribute BORDERCOLOR in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 90-92
  5. Unknown attribute WIDTH in element TD. for browser(s): Lynx2.7 (67 instances)
    Line 321, Line 324, Line 325, Line 341, Line 345, Line 346, Line 362, Line 366, Line 367, Line 384, Line 388, Line 389, Line 404, Line 408, Line 409, Line 432, Line 436, Line 437, Line 449, Line 453, Line 454, Line 467, Line 470, Line 471, Line 483, Line 487, Line 488, Line 511, Line 515, Line 516, Line 529, Line 533, Line 534, Line 545, Line 549, Line 550, Line 561, Line 565, Line 566, Line 585, Line 589, Line 590, Line 608, Line 612, Line 613, Line 627, Line 631, Line 632, Line 643, Line 647, Line 648, Line 658, Line 662, Line 663, Line 682, Line 686, Line 687, Line 698, Line 702, Line 703, Line 714, Line 718, Line 719, Line 732, Line 736, Line 737, Line 770
  6. Unknown attribute NAME in element IMG. for browser(s): Lynx2.7 (7 instances)
    Lines 42-44, Lines 47-49, Lines 52-53, Lines 56-57, Lines 60-61, Lines 64-65, Lines 74-75
  7. Attribute NOSHADE in element HR is assigned an incorrect value. for browser(s): Lynx2.7 (2 instances)
    Line 756, Line 766
  8. Unknown attribute BGCOLOR in element TABLE. for browser(s): Lynx2.7 (2 instances)
    Line 88, Lines 90-92
  9. Required attribute TYPE is missing from tag SCRIPT for browser(s): HTML4.0 (1 instance)
    Line 10
  10. Unknown attribute BORDERCOLORLIGHT in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 90-92
  11. Unknown element name TBODY for browser(s): Navigator4.0 (14 instances)
    Line 105, Line 112, Line 119, Line 303, Line 310, Line 418, Line 425, Line 502, Line 509, Line 576, Line 583, Line 673, Line 680, Line 741
  12. Unknown attribute EEEEER in element IMG. for browser(s): Lynx2.7, Explorer4.01, Navigator4.0, HTML4.0 (1 instance)
    Lines 405-406
  13. Unknown attribute BORDERCOLORDARK in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 90-92
  14. Unknown attribute COLS in element TABLE. for browser(s): HTML4.0 (1 instance)
    Lines 90-92
  15. Unknown attribute BGCOLOR in element TD. for browser(s): Lynx2.7 (1 instance)
    Line 94
  16. Unknown attribute HEIGHT in element TD. for browser(s): Lynx2.7 (21 instances)
    Line 336, Line 357, Line 379, Line 399, Line 427, Line 444, Line 462, Line 478, Line 498, Line 524, Line 540, Line 556, Line 572, Line 603, Line 622, Line 638, Line 653, Line 669, Line 693, Line 709, Line 727

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/docs/white_paper_driscoll.html 43.32 K 12.03
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/bookshelf/images/otd_mlab.gif 22.21 K 6.17
http://thunder.nsstc.nasa.gov/bookshelf/images/lis_trmm.gif 36.78 K 10.22
http://thunder.nsstc.nasa.gov/bookshelf/images/lms_goes.gif 14.92 K 4.14
http://thunder.nsstc.nasa.gov/bookshelf/images/OTD_sensor.gif 11.53 K 3.20
http://thunder.nsstc.nasa.gov/bookshelf/images/LIS_sensor.gif 15.01 K 4.17
http://thunder.nsstc.nasa.gov/bookshelf/images/annual_cycle.gif 4.09 K 1.14
http://thunder.nsstc.nasa.gov/bookshelf/images/year_ocean_land.gif 11.47 K 3.19
http://thunder.nsstc.nasa.gov/bookshelf/images/lat_bands2.gif 6.66 K 1.85
http://thunder.nsstc.nasa.gov/bookshelf/images/OTD.1year.gif 21.34 K 5.93
http://thunder.nsstc.nasa.gov/bookshelf/images/seasons_block.gif 26.78 K 7.44
http://thunder.nsstc.nasa.gov/bookshelf/images/LIS.3months.gif 17.89 K 4.97
http://thunder.nsstc.nasa.gov/bookshelf/images/OKstorm_OTDltg_GOESvis.gif 24.05 K 6.68
http://thunder.nsstc.nasa.gov/bookshelf/images/OTD_LIS_overpass.gif 18.68 K 5.19
http://thunder.nsstc.nasa.gov/bookshelf/images/LIS_TMI_comparison.gif 13.56 K 3.77
http://thunder.nsstc.nasa.gov/bookshelf/images/LIS_PR_comparison.gif 11.23 K 3.12
http://thunder.nsstc.nasa.gov/bookshelf/images/LIS_VIRS_comparison.gif 13.93 K 3.87
http://thunder.nsstc.nasa.gov/bookshelf/images/wsi_lisdad.gif 20.86 K 5.80
http://thunder.nsstc.nasa.gov/bookshelf/images/big_flash_summary.gif 11.49 K 3.19
http://thunder.nsstc.nasa.gov/bookshelf/images/FLA_03_09_LIS_TMI85.gif 19.28 K 5.36
http://thunder.nsstc.nasa.gov/bookshelf/images/FLA_03_09_LIS_TMI37.gif 17.18 K 4.77
http://thunder.nsstc.nasa.gov/bookshelf/images/cyclone_susan2.gif 15.47 K 4.30
http://thunder.nsstc.nasa.gov/bookshelf/images/linda4adj.gif 25.99 K 7.22
http://thunder.nsstc.nasa.gov/bookshelf/images/linda_nep.gif 12.95 K 3.60
http://thunder.nsstc.nasa.gov/bookshelf/images/LMS_sensor.gif 10.57 K 2.94
http://thunder.nsstc.nasa.gov/bookshelf/images/LMS_east_and_west.gif 14.80 K 4.11
http://thunder.nsstc.nasa.gov/images/fullwhite.gif 3.34 K 0.93
Total
483.12 K
134.20
HTTP Request Delays
--
20.50
Total + Delays
--
154.70