(cherry picked from commit 2a640982)

(cherry picked from commit cdaea311)

Conflicts:
	src/isomorphic/classic/class/__tests__/ReactClassMixin-test.js
	src/isomorphic/modern/element/__tests__/ReactJSXElementValidator-test.js
	src/renderers/dom/server/__tests__/ReactServerRendering-test.js
	src/renderers/shared/reconciler/__tests__/ReactInstanceHandles-test.js

(cherry picked from commit c29642d6)

(manual cherry-pick of bb11639e)

Autocorrect and autocapitalize should not be property
(cherry picked from commit eee5d466)

Fix single select incorrectly updating
(cherry picked from commit 2f773678)

Conflicts:
	src/renderers/dom/client/wrappers/__tests__/ReactDOMSelect-test.js

Fix file reference typo in starter
(cherry picked from commit 940a75b1)

Update DOM_OPERATION_TYPES mappings for ReactDefaultPerfAnalysis
(cherry picked from commit 812e1a87)

Fix typos in posts
(cherry picked from commit a0741ab4)

Fix misunderstanding in tutorial
(cherry picked from commit 4865ddf7)

[docs] Update zh-docs with 7e2a7f0c
(cherry picked from commit 1d8b8164)

[docs] fixup other broken youtube-nocookie uses
(cherry picked from commit 5b98152a)

Corrects grammatical errors in tutorial
(cherry picked from commit 88ce0fc9)

Fix typo in youtube url for video in blog post.
(cherry picked from commit 8d0efaf9)

Fix typo (duplicate word)
(cherry picked from commit 9c57c300)

Remove smart quotes from code snippet in blog post
(cherry picked from commit 1b85c9a6)

Add documentation for shallowCompare addon
(cherry picked from commit ab37776c)

Fix children to be a prop in the blog post example
(cherry picked from commit 50af0341)

Added post about components, elements, and instances
(cherry picked from commit bdca170d)

Added post about upgrading your code to avoid isMounted()
(cherry picked from commit ccb97d8e)

Clarify dependency installation
(cherry picked from commit b6a01d77)

Correct highlight in tutorial7.js snippet
(cherry picked from commit 55bd2033)

Adding class->className as a JSX gotcha
(cherry picked from commit 410cc30b)

Clarify usage of `.propTypes` when using functional components
(cherry picked from commit bb084eba)

Fix wrong script name (showdown -> marked)
(cherry picked from commit eeee2722)

Helps avoid a common Issue when following tutorial
(cherry picked from commit f2827100)

Increase severity of setprops and replaceprops deprecations, since their removal is now imminent.
(cherry picked from commit f4744f3a)

Rename minlength to minLength in the tags and attributes documentation page
(cherry picked from commit 526d5c0e)