---------------------------------
Comments on section "Introduction"
----
Provide any comments you have on section Introduction (remember to include
priority, location, suggested revision, and rationale for each comment).
Comments (or a URI pointing to your comments): 

Comment #1:
- Priority: mild suggestion
- Location: Terms and definitions, Common Functionality
- Suggested revision: change defined term to Essential Functionality (and elsewhere in the document where it is used)
- Rationale: the current definition has been adapted from the definition for "essential" given by WCAG 2.0, thus, wording consistency would be improved between WCAG-EM and WCAG 2.0. In addition, this eases differentiating between otherwise unrelated "common functionality" and "common web pages"