Review CSS2 resolutions

[gsnedders]

https://wiki.csswg.org/planning/status has a list of resolutions since August 2013 or so; we should go over all those that apply to CSS2 and ensure we carry out the necessary actions. They should probably have new GitHub issues created for them if they don't already have one.

(mark done when issue filed or if already done)

• Resolved: Make the changes listed in css2.1 and position (Issues: [css-display][css-position] Computed value of float with absolute positioning when there is no box? #1436 (comment) )
• Resolved: Add gsnedders as editor to CSS2.2: c83bd8a
• Resolved: Accept Myles’ proposal to make baseline of overflow non-visible inline blocks the higher of the actual baseline (at initial scroll position) and the margin-box bottom. Separately investigate whether to switch from margin-box bottom to padding-box bottom for sanity. (requries web-compat check): Baseline of overflow non-visible inline blocks #2781
• Resolved: Moving a float to the next fragmentainer does not move in-flow content that comes after the float. (However, per CSS2.1, subsequent floats do move down.)
• Resolved: Add the form feed character (U+000C) and make sure all CSS specs align on the definition of white space.
• ACTION Bert to take Rossen's text and export it to level 2 <trackbot> Created ACTION-699.: Make position: fixed a full stacking context #2785
• Resolved: FPWD of CSS2.2.
• Resolved: Republish CSS2.1 with more angry red boxes.
• Resolved: Change the 3rd bullet point of margin collapsing (CSS 2.1 section 8.3.1): Bottom margin of last inflow child and the bottom margin of parent, no longer collapse if the parent has non-zero min-height and the bottom margin of the last inflow child collapses with the top margin of the parent. Exact changes pending more testing.: Margin collapsing: pathological collapsing behaviour for auto-height, non-zero min-height elements with self-collapsing child (Issue 211) #2769 (comment)
• Resolved: Backport @charset parsing rules from CSS3 to CSS2.1. dbaron to propose errata; zcorpan to update tests.
• ACTION fantasai: propose errata for margin collapsing issue<trackbot> Created ACTION-666: Margin collapsing: pathological collapsing behaviour for auto-height, non-zero min-height elements with self-collapsing child (Issue 211) #2769 (comment)
• ACTION dbaron: propose errata for @charset in 2.1 that brings it into alignment with CSS3 Syntax<trackbot> Created ACTION-665
• ACTION zcorpan edit CSS 2.1 @charset tests to make them compliant with CSS3 syntax Created ACTION-667
• Resolved: Change to MAY on default object size shrinking from 300×150 for small devices.