CSS22 changes section review

Sharing my notes from review of
https://www.w3.org/TR/CSS22/changes.html

2011-10-12 - OK
2011-10-12 - OK
2012-04-04 - think it's ok, but maybe double-check
2012-04-11 - 10.7 -
 - should apply the same change to 10.4, since part applies there (?)
2012-04-11 - 8.3.1 - think it's ok, but maybe double-check
2012-05-02 - 15.3 - ok
2012-05-02 - 4.3.1/4.1.1 - surprised this is complete, but seems ok
2012-08-01 - 10.1 - ok, I guess -- this is for flex/grid?
2012-08-01 - 9.4 - ok
2012-08-01 - 9.4.2 - ok
2012-08-01 - 17.4 - ok
2012-08-01 - 17.5 - ok
2012-08-01 - 11.1 - OK only given 2013-07-15 as well
2013-04-29 - 4.1.1 and G.2 - ok
2013-04-29 - 4.1.1 and 4.1.3 - ok
2013-05-02 - 4.4 - NEED TO CHECK AGAINST syntax & ENCODING - PROBABLY WRONG
 - certainly doesn't match our implementation
2013-07-15 - 11.1.1 - ok
2013-07-15 - 15.3 - ok
2013-07-15 - G.2 and G.1 - G.1 edit could drop the now-redundant [].
2013-07-18 - ok, although 10.2 and 10.5 should match in terms of ()
2013-09-09 - ok
2012-09-19 - 9.2 and 9.2.1 -
  first sentence not good.  unbalanced quotes.
  end doesn't make sense (but that part is just moved)
  and why is "principal box" associated with "certain values of ..."?

  "a block-level box is also a block container box unless it is a table
  box or the principal box of a replaced element"
  - principal box condition seems wrong.
2012-09-19 - 9.2.4
 - not sure what the "a principal" does here?
 - what does it mean for a box to be / not be "principal".
   Not clear from previous edit.
2012-09-19 - 17.4 - similar concern about "principal"
2012-09-19 - 4.1.1 - ok
2014-07-16 - commentary describing change should say "transparent"
 rather than "undefined"
 - actual text should have final sentence beginning with capital letter.
2015-07-01 - ok
2015-09-05 - explanatory text could perhaps be clearer that the difference
  is that @-rules can be terminated by a {}
  - otherwise ok

-- 
𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                          https://www.mozilla.org/   𝄂
             Before I built a wall I'd ask to know
             What I was walling in or walling out,
             And to whom I was like to give offense.
               - Robert Frost, Mending Wall (1914)