Bobby
URL tested: http://thunder.nsstc.nasa.gov/data/OTDbrowse/oct96.html, January 7, 2002 10:01:19 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. (29 instances)
    Line 180, Line 185, Line 190, Line 195, Line 210, Line 215, Line 220, Line 225, Line 230, Line 235, Line 240, Line 248, Line 253, Line 258, Line 263, Line 268, Line 273, Line 278, Line 286, Line 291, Line 296, Line 301, Line 306, Line 311, Line 316, Line 324, Line 329, Line 334, Line 339

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. (47 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 180, Line 185, Line 190, Line 195, Line 210, Line 215, Line 220, Line 225, Line 230, Line 235, Line 240, Line 248, Line 253, Line 258, Line 263, Line 268, Line 273, Line 278, Line 286, Line 291, Line 296, Line 301, Line 306, Line 311, Line 316, Line 324, Line 329, Line 334, Line 339, Line 388
  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 363
  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 363
  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. (79 instances)
    Line 85, Line 134, Line 151, Line 155, Line 158, Line 161, Line 180, Line 181, Line 185, Line 186, Line 190, Line 191, Line 195, Line 196, Line 200, Line 201, Line 202, Line 203, Line 210, Line 211, Line 215, Line 216, Line 220, Line 221, Line 225, Line 226, Line 230, Line 231, Line 235, Line 236, Line 240, Line 241, Line 248, Line 249, Line 253, Line 254, Line 258, Line 259, Line 263, Line 264, Line 268, Line 269, Line 273, Line 274, Line 278, Line 279, Line 286, Line 287, Line 291, Line 292, Line 296, Line 297, Line 301, Line 302, Line 306, Line 307, Line 311, Line 312, Line 316, Line 317, Line 324, Line 325, Line 329, Line 330, Line 334, Line 335, Line 339, Line 340, Line 344, Line 345, Line 346, Line 347, Line 357, Line 362, Line 370, Line 381, Line 382
  2. Use relative sizing and positioning (% values) rather than absolute (pixels). (143 instances)
    Line 86, Line 136, Line 155, Line 157, Line 158, Line 161, Line 176, Line 177, Line 178, Line 180, Line 181, Line 183, Line 185, Line 186, Line 188, Line 190, Line 191, Line 193, Line 195, Line 196, Line 198, Line 200, Line 201, Line 202, Line 203, Line 208, Line 210, Line 211, Line 213, Line 215, Line 216, Line 218, Line 220, Line 221, Line 223, Line 225, Line 226, Line 228, Line 230, Line 231, Line 233, Line 235, Line 236, Line 238, Line 240, Line 241, Line 246, Line 248, Line 249, Line 251, Line 253, Line 254, Line 256, Line 258, Line 259, Line 261, Line 263, Line 264, Line 266, Line 268, Line 269, Line 271, Line 273, Line 274, Line 276, Line 278, Line 279, Line 284, Line 286, Line 287, Line 289, Line 291, Line 292, Line 294, Line 296, Line 297, Line 299, Line 301, Line 302, Line 304, Line 306, Line 307, Line 309, Line 311, Line 312, Line 314, Line 316, Line 317, Line 322, Line 324, Line 325, Line 327, Line 329, Line 330, Line 332, Line 334, Line 335, Line 337, Line 339, Line 340, Line 342, Line 344, Line 345, Line 346, Line 347, Line 349, Line 350, Line 363
  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 388
  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 363
  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 363

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 363
  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 363

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 183, Line 188, Line 193, Line 198, Line 208, Line 213, Line 218, Line 223, Line 228, Line 233, Line 238, Line 246, Line 251, Line 256, Line 261, Line 266, Line 271, Line 276, Line 284, Line 289, Line 294, Line 299, Line 304, Line 309, Line 314, Line 322, Line 327, Line 332, Line 337, Line 342, Line 349, Line 350
  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 183, Line 188, Line 193, Line 198, Line 208, Line 213, Line 218, Line 223, Line 228, Line 233, Line 238, Line 246, Line 251, Line 256, Line 261, Line 266, Line 271, Line 276, Line 284, Line 289, Line 294, Line 299, Line 304, Line 309, Line 314, Line 322, Line 327, Line 332, Line 337, Line 342, Line 349, Line 350, Line 381
  7. Attribute NOSHADE in element HR is assigned an incorrect value. for browser(s): Lynx2.7 (2 instances)
    Line 366, Line 377
  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 (29 instances)
    Line 180, Line 185, Line 190, Line 195, Line 210, Line 215, Line 220, Line 225, Line 230, Line 235, Line 240, Line 248, Line 253, Line 258, Line 263, Line 268, Line 273, Line 278, Line 286, Line 291, Line 296, Line 301, Line 306, Line 311, Line 316, Line 324, Line 329, Line 334, Line 339

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/oct96.html 16.31 K 4.53
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/1996/jpg/mlab.otd.1_1.1996.275_T.jpg 4.91 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.276_T.jpg 4.90 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.277_T.jpg 4.77 K 1.33
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.278_T.jpg 4.99 K 1.39
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.280_T.jpg 4.95 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.281_T.jpg 4.90 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.282_T.jpg 4.92 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.283_T.jpg 4.98 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.284_T.jpg 3.82 K 1.06
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.285_T.jpg 4.65 K 1.29
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.286_T.jpg 4.97 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.287_T.jpg 4.97 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.288_T.jpg 4.91 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.289_T.jpg 4.41 K 1.22
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.290_T.jpg 4.96 K 1.38
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.291_T.jpg 4.93 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.292_T.jpg 4.55 K 1.26
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.293_T.jpg 4.88 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.294_T.jpg 4.91 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.295_T.jpg 4.86 K 1.35
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.296_T.jpg 4.89 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.297_T.jpg 4.89 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.298_T.jpg 4.88 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.299_T.jpg 4.52 K 1.26
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.300_T.jpg 4.85 K 1.35
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.301_T.jpg 4.90 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.302_T.jpg 4.94 K 1.37
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.303_T.jpg 4.88 K 1.36
http://thunder.nsstc.nasa.gov/data/OTDbrowse/1996/jpg/mlab.otd.1_1.1996.304_T.jpg 3.70 K 1.03
http://thunder.nsstc.nasa.gov/images/fullwhite.gif 3.34 K 0.93
Total
176.46 K
49.02
HTTP Request Delays
--
23.00
Total + Delays
--
72.02