<!--
Thank you for the PR! Contributors like you keep React awesome!
Please see the Contribution Guide for guidelines:
https://github.com/reactjs/reactjs.org/blob/master/CONTRIBUTING.md
If your PR references an existing issue, please add the issue number below
-->
* Rewrite "adding React to existing app"
Fixes#988
* Some copy
* typo
* Update babel instructions
* Update umd link
* Add prod minification section
* Show "button" example in several targets
* wip
* More
* More
* tweak
* yas
* Multi root tip
* moaar
* alot
* Tweak links
* Explain better
* better lead
* tweaks
* tweaks
* wording
* More reassuring tone
* Grammar
* wording
* feedback from readers
* Use id, not class
* More nits
* Re-add a useful section
* Update Ref API in docs
Update to new React.createRef() API in guide "Uncontrolled Components".
* Update Ref API in doc example
Use new Ref API in guide's example.
* Fix syntax error in example
* Update highlighting ranges in docs
After updating to the new createRef API, the highlighting ranges in Uncontrolled Components were wrong.
* Update highlighting ranges in docs example
After updating to the new createRef API, the highlighting ranges in Uncontrolled Components were wrong.
* Update highlighting ranges in docs example
Remove empty line in source code.
* Update uncontrolled-components.md
* Update input-type-file.js
- you can _just_ open it in
- It _renders_ a heading saying “Hello, world!” on the page. - you are using the same word as the thing you are describing.
- “A Note on JavaScript” the title doe snot suggest that you need to read it because you are learning about react ,not JS. Something like “React & JavaScript” or something like “Knowledge Level Assumptions”
- “we recommend **refreshing** your JavaScript knowledge so you can follow along more easily.” — refreshing suggest that someone. Already knows JS, so if they don’t know JS they will feel dejected. Try “We highly recommend [going through a Javascript tutorial]() to check your knowledge level.”
- “We also use some of the ES6 syntax” - **We** that suggests its a us vs the user. Instead go for “**The documentation** will use some [ES6 Syntax](LINK TO WHAT IS ES6)”
It's obvious enough that this is the same method. I don't think repeating its name in the list brings any value, and it puts too much visual emphasis on something we're trying to deemphasize.
