ui5-list: the "selectionChange" event param "items" has been renamed to "selectedItems".
ui5-list: the "backgroundDesign" property has been removed, use the corresponding
CSS variable (--_ui5_listitem_background_color) to alter the list items` background.
ui5-panel: the "backgroundDesign" property has been removed, use the corresponding
CSS variables (--_ui5_panel_background_color) to alter the panel background.
ui5-datepicker: 'liveChange' event has been renamed to 'input'.
ui5-checkbox: property "readOnly" has been renamed to "readonly".
ui5-radiobutton: property "readOnly" has been renamed to "readonly".
the signature of the addCustomCSS method exported by "@ui5/webcomponents-base/Theming.js" is changed from addCustomCSS(tag, theme, css) to addCustomCSS(tag, css)