Description of problem:
When using certain combinations of DocBook tags, and the redhat brand, the output can be difficult to read. This may present accessibility issues to vision impaired users.
For example in http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/ch-Preparing-x86.html
In the Note, the word 'boot:' is barely legible as it appears in white text on a light grey background.
*** This bug has been marked as a duplicate of bug 618902 ***