Common False Results

No automated tool is perfect at identifying accessibility issues. As such, UDOIT will produce some false positive and some false negative results. Below is a list of results that may be false and a brief description of what makes them false. For additional information on identifying false results view the page for the result that concerns you.

False Positives (can be ignored--under certain conditions)

• Links should contain text.
  • The link is an image that needs alt text instead of linked text.
• No table headers found.
  • The table is used for layout instead of data presentation.
    • It is strongly recommended that layout tables be replaced with divs that use display styling Links to an external site. to achieve the same effect.
• No row or column scopes declarations found in headers of the table.
  • The table is complex (using merged/split cells) and uses the scope colgroup or rowgroup on cells that categorize a group of columns or rows.
    • It is strongly recommended that you avoid using complex tables, when possible.
• Insufficient text color contrast with the background.
  • Large (size $\ge$14pt bold or $\ge$18pt) colored font has 3:1 or greater contrast with the background color.
  • Regular sized, colored font has 4.5:1 or greater contrast with the background color.
• Synchronized captions should be provided for prerecorded web-based video.
  • Video has captions (open--i.e. burned in--or closed).
  • YouTube autocaptions were edited, not replaced.
  • Link to a non-video resource contains the word Vimeo in the URL.
• Image elements should have an "alt" attribute.
  • The image with no or null alt text has little to no chance of coming up in discussion or of being used as a reference point for finding other information on the page (i.e. the image is purely decorative).
• Consider adding headings to your document to create more structure.
  • The content is copied from another source or is a subject that doesn't warrant additional section titles.
• Avoid using styles for document structure.
  • The bold text is not meant to be a heading.
• Avoid using color alone for emphasis
  • The text is not colored in order to create emphasis.
  • The text has been bolded or italicized via the respective buttons in the Rich Content Editor toolbar.
  • Other characters such as * have been used in addition to color to indicate emphasis.

False Negatives (require manual auditing and repair)

• Insufficient text color contrast with the background.
  • Insufficient color contrast between colored text and its colored background will go unnoticed by UDOIT if the text has a 4.5:1 or greater contrast with white.
• Headings should contain text.
  
  • Headings containing a space or the Unicode character   will not be identified by UDOIT.
• Synchronized captions should be provided for prerecorded web-based video.
  • A number of uncaptioned, non-YouTube and non-Vimeo videos (including those brought into Canvas with the Record/Upload Media button) will not be flagged by UDOIT.
• Avoid using styles for document structure.
  • Headings created just by increasing the font size will not be detected by UDOIT.
• Avoid using color alone for emphasis
  • If the colored text also violates the "Insufficient text color contrast..." error, then UDOIT will not generate this result unless the contrast is repaired without the checkbox for making the text bold or italicized being checked and the UDOIT scan is run again.

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Last Updated January 2017.
Clemson Online