Example: How the Pieces Fit Together for ALT Text

@@need this specific example? Can we cut this?

[ TO DO: see if can fit with image somehow w/o too much clutter .. maybe a tiny version of sub image items here with text, rather than this text with image. consider reordering these. or maybe just saying as show elements - so not too redundanct...]

• Underlying technical standards
  • HTML IMG element has ALT attribute
• User agents (browers)
  • Provides human interface to ALT
• Assistive technologies (AT)
  • Provides different human interface to ALT
• Users
  • Have to know how to get & understand ALT text
• Developers
  • Have to provide equivalent alt text
• Authoring Tools
  • Allow & encourage ALT