v4.14.0

Enhancements

• Added high contrast outline to ActionList (#2713)
• Added high contrast border to Button (#2712)
• Added styled placeholder image to Avatar when initials are blank (#2693)
• Added a preferInputActivator prop to Popover to allow better positioning of the overlay (#2754)

Bug fixes

• Updated Polaris Tokens, which now builds modern tokens using TypeScript, fixing issues where Edge threw errors related to modern JavaScript features (#2763)
• Fixed TrapFocus stealing focus from other TrapFocus's (#2681)
• Fixed focus state color on monochrome Buttons (#2684)
• Fixed container's width on Modal (#2692)
• Fixed the position property for the backdrop on Select from being overwritten by the focus ring (#2748)
• Fixed ResourceItem Actions visibility on mouse out (#2742)
• Fixed initial server / client render mismatch in Avatar (#2751)

Development workflow

• Added first implementation of custom property validation (#2616)
• Refactored consumer build test (renamed to system integration test) (#2735)
• Added Storybook Knobs for customizing theme (#2674)

Code quality

• Updated dependencies in example apps (#2722)
• Fixed Tabs tests that were preventing React updates (#2702)
• Moved to Travis for CI (#2652)