* fix(status_action_bar): Use aria-pressed for reblog and favourite button
* fix(column_back_button): Keyboard accessible
* fix(status_content): Make focusable and accessible
* fix(dropdown_menu): Use aria-expanded instead of aria-pressed
* fix(emoji_picker_dropdown): Use aria-expanded instead of aria-hidden
* feat(icon_button): Add aria-expanded
* fix(privacy_dropdown): Use aria-expanded instead of aria-hidden
* Fix protruded infomation board section
Set "flexwrap: wrap" for sections. Set upper and lower padding for each section, and adjust clearances around sections accordingly. Settings for viewport threshold 500px is no more needed.
* Fix mistake of reducing information-board padding
In according with this fix, additional padding setting for maximum 840px width is no more needed.
* fix(web_push_notification): Do not hard reload tab
* fix(web_push_notification_worker): Guard against null subscription
* refactor: Incorporate pull request feedback
* fix(dropdown_menu): Keyboard navigation
* fix(icon_button): Add aria-pressed attribute
* fix(privacy_dropdown): Make accessible
* fix(emoji_picker_dropdown): Make accessible
* fix(icon_button): Support tabIndex
* fix(actions_modal): Remove icon from tab order
* fix(dropdown_menu): Add role=group
* fix(setting_toggle): Toggle via space key
* fix(dropdown_menu): Remove redundant handling of Space key
* fix(emoji_picker_dropdown): Remove redundant Space key handling
* fix(privacy_dropdown): Remove redundant Space key handling
* fix(status): Switch to article and add aria-posinset, aria-setsize
* fix(status_list): Use role=feed and pass more ARIA props to Status
* chore(eslint): jsx-a11y/role-supports-aria-props
* fix(dropdown_menu): Open as modal on mobile
* fix(dropdown_menu): Open modal on touch
* fix(dropdown_menu): Show status
* fix(dropdown_menu): Max dimensions and reduce padding
* chore(dropdown_menu): Test new functionality
* refactor: Use DropdownMenuContainer instead of DropdownMenu
* feat(privacy_dropdown): Open as modal on touch devices
* feat(modal_root): Do not load actions-modal async
`height: 100%` in `align-self: stretch` flexboxes doesn't work on Safari < 11.
https://bugs.webkit.org/show_bug.cgi?id=137730
This workaround uses flexbox instead of `height: 100%` to stretch height.
* fix(column_header): Invalid ARIA role
* fix(column): Remove hidden nodes from the DOM
* refactor(column_link): Remove unused property hideOnMobile
* fix(column_header): Use aria-pressed
* fix(column_header): Make collapsed content not focusable, add focusable property
* fix(column_loading): Make header non-focusable
* fix(column_settings): Use role to group the toggles
