The optional complementary title(s) are the final part(s) of a standard’s title. Complementary titles follow the main part of the title (<main>) and (typically) provide details concerning which particular aspect of the general topic is treated by the standards document.
Any combination of:
Text, numbers, or special characters
External Linking Elements
<inline-supplementary-material> Inline Supplementary Material
Related Material Elements
Emphasis Elements
Inline Display Elements
Math Elements
Other Inline Elements
Baseline Change Elements
Citation Elements