<alt-text> Alternate Title Text For a Figure, Etc.

Short phrase used for pronunciation or as an alternative display for a structure or graphical object, typically for reasons of accessibility or graphic-limited devices. For example, <alt-text> may be used to display “behind” a figure, table, graphic, or other structure.
Related Elements
The similarly non-visual element <long-desc> is meant for an extended description of the figure, table, graphic, inline-graphic, etc.
Attributes

Base Attributes

Models and Context
May be contained in
Model Description
Text, numbers, or special characters
Tagged Samples
To provide simple text that can be pronounced by eReaders in addition to or instead of visual graphic
...
<fig id="f00001">
 <label>FIG. 1</label>
 <caption>
  <p>Single-Hub and Double-Hub Cast Iron Soil Pipe Laying Lengths</p>
 </caption>
 <graphic xlink:href="http://www.astm.org/HTTP/IMAGES/A0074_60200.png">
  <alt-text>Single-Hub and Double-Hub Cast Iron Soil Pipe Laying Lengths</alt-text>
 </graphic>
</fig>
...
To provide additional information concerning figure for graphic-impaired
...
<fig>
 <caption><title>Truth Table</title></caption>
 <alt-text>Truth Table: NOR Gate</alt-text>
 <long-desc>Truth table showing that the output of a NOR gate is zero 
  if any of the input is 1 and the output is 1 only if both the inputs 
  of the gate is 0.</long-desc>
 <graphic xlink:href="flip-flop-NOR-gate.jpg"></graphic>
</fig>
...
To provide readable/pronounceable alternative to inline graphic
... 
<sec>
 <label>79.1</label>
 <p>Elongate ... in the form of a 
  <private-char description="dogleg">
   <inline-graphic  
     xlink:href="http://www1.astm.org/HTTP/IMAGESxHTML/images/glyphs/ASTM_SpecChar/dogleg_12">
    <alt-text content-type="special character">dogleg character</alt-text>
   </inline-graphic>
  </private-char>. During the ...</p>
</sec>
...
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