Remove convoluted conditions from component's element type calculations @kuzhelov (#1396)
Replace Dropdown variables: borderRadius with containerBorderRadius, openBorderRadius with openAboveContainerBorderRadius and openBelowContainerBorderRadius, listBorderRadius with aboveListBorderRadius and belowListBorderRadius @Bugaa92 (#1312)

ESC key pressed on a trigger element should propagate event if Popup is closed @sophieH29 (#1373)
Changing icon behavior as for some cases icon could be visible @kolaps33 (#1327)
Firefox: placeholder color should match redlines @notandrew (#1406)
Popup - fix proptypes for content and trigger props @miroslavstastny (#1420)
Make contentRef prop optional for Accordion.Title @Bugaa92 (#1418)
Call getDerivedStateFromProps() from AutoControlledComponent in Dropdown @layershifter (#1416)
Fix backgroundHover1 color in the Teams dark theme colorScheme @mnajdova (1437)
Revert changes with different roots in Icon component @layershifter (#1435)
Fix flickering issues with Dropdown and Popup components @Bugaa92 (#1434)

Add keyboard navigation and screen reader support for Accordion @silviuavram (#1322)
Add expanded prop to Accordion @silviuavram (#1322)
Replace react-popper package with custom Popper component and exposed as UNSTABLE_Popper positioning helper @Bugaa92 (#1358)
Add strict types for the colorScheme props used in the components' variables @mnajdova (#1340)
Export message-seen, presence-available, presence-stroke, open-outside and eye-friendlier icons to Teams theme @joheredi (#1390)
Add 'lightning' icon to Teams theme @notandrew (#1385)
Add automatic positioning inside viewport for Menu with submenus @Bugaa92 (#1384)
Add align, position, offset props for Dropdown component @Bugaa92 (#1312)
Add Checkbox component and toggle prop for it @layershifter (#1405)