HP Intelligent Management Center Standard Software Platform - Manual (Page 779)

Providing extra information for each value can make a data table appear
cluttered for people without vision impairments, so you may want to hide the
extra text objects by changing the font color to the same color as the
background. The extra text is invisible, but is still detected and read by screen
readers.
Crystal Reports 2008 SP3 User's Guide 779
C Creating Accessible Reports
Improving data table accessibility