Bobby
URL tested: http://thunder.nsstc.nasa.gov/data/OTDsummaries/, January 7, 2002 10:01:13 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 page does not meet the requirements for Bobby Approved status. Below is a list of 1 Priority 1 accessibility errors found:

  1. Provide alternative text for all images. (18 instances)
    Line 172, Line 173, Line 174, Line 175, Line 176, Line 177, Line 213, Line 214, Line 215, Line 216, Line 217, Line 218, Line 304, Line 305, Line 306, Line 307, Line 308, Line 309

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. (36 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 172, Line 173, Line 174, Line 175, Line 176, Line 177, Line 213, Line 214, Line 215, Line 216, Line 217, Line 218, Line 304, Line 305, Line 306, Line 307, Line 308, Line 309, Line 450
  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. (8 instances)
    Line 87, Line 162, Line 153, Line 203, Line 194, Line 294, Line 284, Line 425
  4. If a table has two or more rows or columns that serve as headers, use structural markup to identify their hierarchy and relationship. (12 instances)
    Line 119, Line 87, Lines 139-141, Line 137, Line 162, Line 153, Line 203, Line 262, Line 194, Line 294, Line 284, Line 425
  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.

Not Bobby ApprovedThis page does not yet meet the requirements for Bobby Approved status.


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. (202 instances)
    Line 86, Line 135, Line 143, Line 150, Line 156, Line 165, Line 166, Line 167, Line 168, Line 169, Line 181, Line 182, Line 183, Line 184, Line 185, Line 197, Line 206, Line 207, Line 208, Line 209, Line 210, Line 222, Line 223, Line 224, Line 225, Line 226, Line 230, Line 231, Line 232, Line 233, Line 234, Line 238, Line 239, Line 240, Line 241, Line 242, Line 246, Line 247, Line 248, Line 249, Line 250, Line 257, Line 265, Line 266, Line 267, Line 271, Line 272, Line 273, Line 287, Line 297, Line 298, Line 299, Line 300, Line 301, Line 313, Line 314, Line 315, Line 316, Line 317, Line 321, Line 322, Line 323, Line 324, Line 325, Line 329, Line 330, Line 331, Line 332, Line 333, Line 337, Line 338, Line 339, Line 340, Line 341, Line 345, Line 346, Line 347, Line 348, Line 349, Line 353, Line 354, Line 355, Line 356, Line 357, Line 361, Line 362, Line 363, Line 364, Line 365, Line 369, Line 370, Line 371, Line 372, Line 373, Line 377, Line 378, Line 379, Line 380, Line 381, Line 385, Line 386, Line 387, Line 388, Line 389, Line 393, Line 394, Line 395, Line 396, Line 397, Line 401, Line 402, Line 403, Line 404, Line 405, Line 412, Line 424, Line 432, Line 443, Line 444
  2. Use relative sizing and positioning (% values) rather than absolute (pixels). (3 instances)
    Line 87, Line 137, Line 425
  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

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

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

  2. Avoid using movement in images where possible. (35 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 172, Line 173, Line 174, Line 175, Line 176, Line 177, Line 213, Line 214, Line 215, Line 216, Line 217, Line 218, Line 304, Line 305, Line 306, Line 307, Line 308, Line 309, Line 450
  3. Avoid using tables to format text documents in columns unless the table can be linearized. (12 instances)
    Line 119, Line 87, Lines 139-141, Line 137, Line 162, Line 153, Line 203, Line 262, Line 194, Line 294, Line 284, Line 425
  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. 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. (12 instances)
    Line 119, Line 87, Lines 139-141, Line 137, Line 162, Line 153, Line 203, Line 262, Line 194, Line 294, Line 284, Line 425

User Checks

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

  1. Provide abbreviations for long row or column labels. (12 instances)
    Line 119, Line 87, Lines 139-141, Line 137, Line 162, Line 153, Line 203, Line 262, Line 194, Line 294, Line 284, Line 425
  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. (12 instances)
    Line 87, Line 119, Line 137, Lines 139-141, Line 153, Line 162, Line 194, Line 203, Line 262, Line 284, Line 294, Line 425

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 ALIGH in element DIV. for browser(s): Lynx2.7, Explorer4.01, Navigator4.0, HTML4.0 (3 instances)
    Line 86, Line 135, Line 150
  2. Unknown attribute BGCOLOR in element TR. for browser(s): Lynx2.7 (6 instances)
    Line 154, Line 160, Line 163, Line 171, Line 204, Line 212
  3. Attribute ALINK in element BODY needs a valid color. for browser(s): Explorer4.01, Navigator4.0 (1 instance)
    Line 8
  4. Unknown attribute BORDERCOLOR in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (1 instance)
    Lines 139-141
  5. Unknown attribute NAME in element IMG. for browser(s): Lynx2.7 (1 instance)
    Lines 123-124
  6. Unknown attribute WIDTH in element TD. for browser(s): Lynx2.7 (2 instances)
    Line 143, Line 443
  7. Attribute NOSHADE in element HR is assigned an incorrect value. for browser(s): Lynx2.7 (2 instances)
    Line 428, Line 439
  8. Unknown attribute BGCOLOR in element TABLE. for browser(s): Lynx2.7 (9 instances)
    Line 137, Lines 139-141, Line 153, Line 162, Line 194, Line 203, Line 262, Line 284, Line 294
  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 HTTP-EQUIV in element META. for browser(s): Lynx2.7 (1 instance)
    Line 2
  13. Unknown attribute COLS in element TABLE. for browser(s): HTML4.0 (1 instance)
    Lines 139-141
  14. Unknown attribute BGCOLOR in element TD. for browser(s): Lynx2.7 (13 instances)
    Line 143, Line 296, Line 297, Line 298, Line 299, Line 300, Line 301, Line 304, Line 305, Line 306, Line 307, Line 308, Line 309
  15. Required attribute ALT is missing from tag IMG for browser(s): HTML4.0 (18 instances)
    Line 172, Line 173, Line 174, Line 175, Line 176, Line 177, Line 213, Line 214, Line 215, Line 216, Line 217, Line 218, Line 304, Line 305, Line 306, Line 307, Line 308, Line 309

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/data/OTDsummaries/ 27.99 K 7.78
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_front_middle1.gif 0.38 K 0.11
http://thunder.nsstc.nasa.gov/images/tabs/listab_front_dataset.gif 0.72 K 0.20
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_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_dataset_info.jpg 9.90 K 2.75
http://thunder.nsstc.nasa.gov/images/blank_spacer.gif 0.08 K 0.02
http://thunder.nsstc.nasa.gov/images/fullwhite.gif 3.34 K 0.93
Total
47.39 K
13.16
HTTP Request Delays
--
9.00
Total + Delays
--
22.16