react-dom

React

• React package and browser build no longer "secretly" includes React DOM. (@sebmarkbage in #7164 and #7168)
• Required PropTypes now fail with specific messages for null and undefined. (@chenglou in #7291)
• Improved development performance by freezing children instead of copying. (@keyanzhang in #7455)

React DOM

• Fixed occasional test failures when React DOM is used together with shallow renderer. (@goatslacker in #8097)
• Added a warning for invalid aria- attributes. (@jessebeach in #7744)
• Added a warning for using autofocus rather than autoFocus. (@hkal in #7694)
• Removed an unnecessary warning about polyfilling String.prototype.split. (@nhunzaker in #7629)
• Clarified the warning about not calling PropTypes manually. (@jedwards1211 in #7777)
• The unstable batchedUpdates API now passes the wrapped function's return value through. (@bgnorlov in #7444)
• Fixed a bug with updating text in IE 8. (@mnpenner in #7832)

React Perf

• When ReactPerf is started, you can now view the relative time spent in components as a chart in Chrome Timeline. (@gaearon in #7549)

React Test Utils

• If you call Simulate.click() on a <input disabled onClick={foo} /> then foo will get called whereas it didn't before. (@nhunzaker in #7642)

React Test Renderer

• Due to packaging changes, it no longer crashes when imported together with React DOM in the same file. (@sebmarkbage in #7164 and #7168)
• ReactTestRenderer.create() now accepts {createNodeMock: element => mock} as an optional argument so you can mock refs with snapshot testing. (@Aweary in #7649, #8261)