Bobby
URL tested: http://thunder.nsstc.nasa.gov/data/OTDbrowse/oct97.html, January 7, 2002 10:01:18 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. (31 instances)
    Line 181, Line 186, Line 191, Line 196, Line 204, Line 209, Line 214, Line 219, Line 224, Line 229, Line 234, Line 242, Line 247, Line 252, Line 257, Line 262, Line 267, Line 272, Line 280, Line 285, Line 290, Line 295, Line 300, Line 305, Line 310, Line 318, Line 323, Line 328, Line 333, Line 338, Line 343

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. (49 instances)
    Lines 88-89, Lines 90-92, Lines 93-94, Lines 95-97, Lines 98-99, Lines 100-101, Lines 102-103, Lines 104-105, Lines 106-107, Lines 108-109, Lines 110-111, Lines 112-113, Lines 114-115, Lines 120-121, Lines 122-123, Lines 124-125, Lines 129-130, Line 181, Line 186, Line 191, Line 196, Line 204, Line 209, Line 214, Line 219, Line 224, Line 229, Line 234, Line 242, Line 247, Line 252, Line 257, Line 262, Line 267, Line 272, Line 280, Line 285, Line 290, Line 295, Line 300, Line 305, Line 310, Line 318, Line 323, Line 328, Line 333, Line 338, Line 343, Line 384
  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. (2 instances)
    Line 86, Line 359
  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 118, Line 86, Lines 138-140, Line 136, Line 152, Line 359
  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. (75 instances)
    Line 85, Line 134, Line 151, Line 155, Line 158, Line 161, Line 181, Line 182, Line 186, Line 187, Line 191, Line 192, Line 196, Line 197, Line 204, Line 205, Line 209, Line 210, Line 214, Line 215, Line 219, Line 220, Line 224, Line 225, Line 229, Line 230, Line 234, Line 235, Line 242, Line 243, Line 247, Line 248, Line 252, Line 253, Line 257, Line 258, Line 262, Line 263, Line 267, Line 268, Line 272, Line 273, Line 280, Line 281, Line 285, Line 286, Line 290, Line 291, Line 295, Line 296, Line 300, Line 301, Line 305, Line 306, Line 310, Line 311, Line 318, Line 319, Line 323, Line 324, Line 328, Line 329, Line 333, Line 334, Line 338, Line 339, Line 343, Line 344, Line 353, Line 358, Line 366, Line 377, Line 378
  2. Use relative sizing and positioning (% values) rather than absolute (pixels). (139 instances)
    Line 86, Line 136, Line 155, Line 157, Line 158, Line 161, Line 176, Line 177, Line 178, Line 179, Line 181, Line 182, Line 184, Line 186, Line 187, Line 189, Line 191, Line 192, Line 194, Line 196, Line 197, Line 202, Line 204, Line 205, Line 207, Line 209, Line 210, Line 212, Line 214, Line 215, Line 217, Line 219, Line 220, Line 222, Line 224, Line 225, Line 227, Line 229, Line 230, Line 232, Line 234, Line 235, Line 240, Line 242, Line 243, Line 245, Line 247, Line 248, Line 250, Line 252, Line 253, Line 255, Line 257, Line 258, Line 260, Line 262, Line 263, Line 265, Line 267, Line 268, Line 270, Line 272, Line 273, Line 278, Line 280, Line 281, Line 283, Line 285, Line 286, Line 288, Line 290, Line 291, Line 293, Line 295, Line 296, Line 298, Line 300, Line 301, Line 303, Line 305, Line 306, Line 308, Line 310, Line 311, Line 316, Line 318, Line 319, Line 321, Line 323, Line 324, Line 326, Line 328, Line 329, Line 331, Line 333, Line 334, Line 336, Line 338, Line 339, Line 341, Line 343, Line 344, Line 346, Line 359
  3. Make sure event handlers do not require use of a mouse. (6 instances)
    Line 90, Line 95, Line 100, Line 104, Line 108, Line 112

User Checks

6 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 152
  2. Check that the foreground and background colors contrast sufficiently with each other.

  3. Avoid using movement in images where possible. (17 instances)
    Lines 88-89, Lines 90-92, Lines 93-94, Lines 95-97, Lines 98-99, Lines 100-101, Lines 102-103, Lines 104-105, Lines 106-107, Lines 108-109, Lines 110-111, Lines 112-113, Lines 114-115, Lines 120-121, Lines 122-123, Lines 124-125, Line 384
  4. If scripts create pop-up windows or change the active window, ensure that the user is aware this is happening. (8 instances)
    Line 9, Line 39, Line 49, Line 55, Line 61, Line 67, Line 73, Line 79
  5. Avoid using tables to format text documents in columns unless the table can be linearized. (5 instances)
    Line 118, Line 86, Lines 138-140, Line 136, Line 359
  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. (6 instances)
    Line 118, Line 86, Lines 138-140, Line 136, Line 152, Line 359

User Checks

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

  1. Provide abbreviations for long row or column labels. (6 instances)
    Line 118, Line 86, Lines 138-140, Line 136, Line 152, Line 359
  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. (6 instances)
    Line 86, Line 118, Line 136, Lines 138-140, Line 152, Line 359

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 HEIGHT in element TD. for browser(s): Lynx2.7 (35 instances)
    Line 176, Line 177, Line 178, Line 179, Line 184, Line 189, Line 194, Line 202, Line 207, Line 212, Line 217, Line 222, Line 227, Line 232, Line 240, Line 245, Line 250, Line 255, Line 260, Line 265, Line 270, Line 278, Line 283, Line 288, Line 293, Line 298, Line 303, Line 308, Line 316, Line 321, Line 326, Line 331, Line 336, Line 341, Line 346
  2. Unknown attribute ALIGH in element DIV. for browser(s): Lynx2.7, Explorer4.01, Navigator4.0, HTML4.0 (2 instances)
    Line 85, Line 134
  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 (2 instances)
    Lines 138-140, Line 152
  5. Unknown attribute NAME in element IMG. for browser(s): Lynx2.7 (1 instance)
    Lines 122-123
  6. Unknown attribute WIDTH in element TD. for browser(s): Lynx2.7 (39 instances)
    Line 142, Line 143, Line 144, Line 176, Line 177, Line 178, Line 179, Line 184, Line 189, Line 194, Line 202, Line 207, Line 212, Line 217, Line 222, Line 227, Line 232, Line 240, Line 245, Line 250, Line 255, Line 260, Line 265, Line 270, Line 278, Line 283, Line 288, Line 293, Line 298, Line 303, Line 308, Line 316, Line 321, Line 326, Line 331, Line 336, Line 341, Line 346, Line 377
  7. Attribute NOSHADE in element HR is assigned an incorrect value. for browser(s): Lynx2.7 (2 instances)
    Line 362, Line 373
  8. Unknown attribute BGCOLOR in element TABLE. for browser(s): Lynx2.7 (2 instances)
    Line 136, Lines 138-140
  9. Required attribute TYPE is missing from tag SCRIPT for browser(s): HTML4.0 (8 instances)
    Line 9, Line 39, Line 49, Line 55, Line 61, Line 67, Line 73, Line 79
  10. Unknown attribute BORDERCOLORLIGHT in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (2 instances)
    Lines 138-140, Line 152
  11. Unknown attribute BORDERCOLORDARK in element TABLE. for browser(s): Lynx2.7, Navigator4.0, HTML4.0 (2 instances)
    Lines 138-140, Line 152
  12. Unknown attribute HEIGHT in element TH. for browser(s): Lynx2.7, Explorer4.01 (1 instance)
    Line 157
  13. Unknown attribute COLS in element TABLE. for browser(s): HTML4.0 (1 instance)
    Lines 138-140
  14. Unknown attribute BGCOLOR in element TD. for browser(s): Lynx2.7 (3 instances)
    Line 142, Line 143, Line 144
  15. Required attribute ALT is missing from tag IMG for browser(s): HTML4.0 (31 instances)
    Line 181, Line 186, Line 191, Line 196, Line 204, Line 209, Line 214, Line 219, Line 224, Line 229, Line 234, Line 242, Line 247, Line 252, Line 257, Line 262, Line 267, Line 272, Line 280, Line 285, Line 290, Line 295, Line 300, Line 305, Line 310, Line 318, Line 323, Line 328, Line 333, Line 338, Line 343

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/OTDbrowse/oct97.html 16.42 K 4.56
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_data.jpg 12.15 K 3.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.274_T.jpg 4.15 K 1.15
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.275_T.jpg 4.97 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.276_T.jpg 4.95 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.277_T.jpg 4.91 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.278_T.jpg 4.93 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.279_T.jpg 4.55 K 1.26
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.280_T.jpg 4.92 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.281_T.jpg 4.98 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.282_T.jpg 4.96 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.283_T.jpg 4.18 K 1.16
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.284_T.jpg 4.92 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.285_T.jpg 4.94 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.286_T.jpg 4.05 K 1.13
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.287_T.jpg 4.95 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.288_T.jpg 4.95 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.289_T.jpg 4.96 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.290_T.jpg 4.91 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.291_T.jpg 4.95 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.292_T.jpg 4.98 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.293_T.jpg 4.67 K 1.30
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.294_T.jpg 4.97 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.295_T.jpg 4.94 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.296_T.jpg 4.95 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.297_T.jpg 4.98 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.298_T.jpg 4.10 K 1.14
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.299_T.jpg 5.00 K 1.39
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.300_T.jpg 5.00 K 1.39
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.301_T.jpg 5.00 K 1.39
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.302_T.jpg 5.00 K 1.39
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.303_T.jpg 4.99 K 1.39
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1997/jpg/mlab.otd.1_1.1997.304_T.jpg 4.02 K 1.12
http://thunder.nsstc.nasa.gov/images/fullwhite.gif 3.34 K 0.93
Total
186.72 K
51.87
HTTP Request Delays
--
24.00
Total + Delays
--
75.87