Fixes #15840.  Don't allow mousedown on placeholder text to activate any default handlers, bypassing Textbox handling.
fix doc typo, fixes #16039 !strict
note that model can't currently be changed dynamically, refs #16033 !strict
Rework fix to #14341 so that properties can still be modified in postMixInProperties().  Refs #16080, #14341 on trunk !strict.
Fix clicking on !TreeNode's expando node in high contrast mode, refs #16098, fixing it on trunk !strict.
convert non-robot BorderContainer test to AMD, refs #14279
Make the tab order between panes and splitters match the visual layout: for any pane in a !BorderContainer that is region=bottom, right, or trailing, and splitter=true, insert the splitter in the HTML before the pane, rather than after.  Fixes #16103 !strict.
Fix aria settings for indeterminate !ProgressBar, thanks Mike, fixes #16000 !strict.
Ignore rounding errors in !StackContainer unit test, fixes #16131.
Restrict walkTree() workaround code to IE8 or less, since it actually makes things worse on IE10.   Also ignore IE10 rounding errors. Fixes #16130.
Ignore IE10 rounding errors, fixes #16125.
Avoid spurious failures due to IE10 rounding errors, fixes #16121
Fix aria roles for drop downs, changes from Mike Billau (IBM, CCLA), thanks!

Fixes #15885 !strict.
Various aria fixes for Editor, plus accessibility updates to test files, patches from Mike Billau (IBM, CCLA), fixes #16139, #16140 !strict
Fixes #16086.  Within CSS rules, line-height: specificity must come after font: since the latter is a shortcut that includes line-height.
Fixes #16091.  Remove aria-readonly since it's only valid for role=textbox and screen readers pick it up natively from the DOM attribute for TextBox widgets.
Fixes #16078.  Add support for aria-label on form widgets since aria-labelledby cannot always be used.
Fixes #16137.  Proxy commit for Mike Billau (IBM, CCLA).  Fix form test a11y violations  generated by RPT.
Fixes #15398. Add proper roles to ComboBox.  Proxy commit for Mike Billau (IBM, CCLA).
Fixes #16027.  Add role=checkbox/radio and aria-checked to CheckBox and RadioButton widgets.