[css-ui] Remove outdated at-risk note

Author: frivoal

css-ui-3/Overview.bs

@@ -68,37 +68,6 @@ url: https://www.w3.org/TR/CSS21/visuren.html#position-props; type: property; sp
     text: right
 </pre>
 
-<!--
-At risk due to only one implementation:
-
-Not at risk:
-<li>box-sizing implemented by IE5/Mac, Opera
-	-moz-box-sizing implemented by Mozilla
-
-<li>outline, outline-width, outline-color, outline-style all in CSS 2.1
-<li>outline-offset property
-	implemented by Safari 1.2
-
-<li>cursor property:
-	CSS2.1: auto | default | help | pointer | wait | crosshair | text |
-e-resize | n-resize | ne-resize | nw-resize | s-resize | se-resize | sw-resize | w-resize
-	IE5/Mac implements: none | progress | cell
-	IE6/Windows implements: <uri> | progress | not-allowed | no-drop | vertical-text | all-scroll | col-resize | row-resize | move |
-	Mozilla implements: progress | cell(as -moz-cell) | alias(as -moz-alias) | copy(as -moz-copy) | context-menu(as -moz-context-menu) |
-	freedesktop.org copied all the cursors from the CSS3-UI LC Working Draft
-		by FredrikHoeglund - 14 Oct 2003
-		http://freedesktop.org/Standards/cursor-spec
-
-<li>'cursor' property values: ew-resize | ns-resize | nesw-resize | nwse-resize
-implemented by Firefox and Safari
-
-<li>'resize' property
-implemented by Firefox 4 and Safari
-<li>nav-up, nav-down, nav-right, nav-left properties
-implemented by Opera/Presto desktop with "shift+arrow", and Blink, as well as Samsung in webkit http://www.w3.org/2013/11/27-css-irc
-
--->
-
 
 <h2 id="intro">Introduction</h2>
 
@@ -597,9 +566,6 @@ how to convey the resizing mechanism to the user.
 The user agent must allow the user to resize the element
 with no other constraints than what is imposed by
 'min-width', 'max-width', 'min-height', and 'max-height'.
-(The "must" is <a href="https://wiki.csswg.org/spec/css3-ui#issue-53">at risk</a>
-since
-<a href="http://lists.w3.org/Archives/Public/www-style/2014Dec/0063.html">only Firefox currently supports this</a>, and may be downgraded to a "should".)
 
 Note: There may be situations where user attempts to resize an element
 appear to be overriden or ignored, e.g. because of ''!important'' cascading declarations that supersede

css-ui-4/Overview.bs

@@ -541,9 +541,6 @@ how to convey the resizing mechanism to the user.
 The user agent must allow the user to resize the element
 with no other constraints than what is imposed by
 'min-width', 'max-width', 'min-height', and 'max-height'.
-(The "must" is <a href="https://wiki.csswg.org/spec/css3-ui#issue-53">at risk</a>
-since
-<a href="http://lists.w3.org/Archives/Public/www-style/2014Dec/0063.html">only Firefox currently supports this</a>, and may be downgraded to a "should".)
 
 Note: There may be situations where user attempts to resize an element
 appear to be overriden or ignored, e.g. because of ''!important'' cascading declarations that supersede