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Merge pull request #4469 from KevinTCoughlin/kevintcoughlin/#4265
Fixes #4265 - Clarify React.render note in documentation
(cherry picked from commit fab001aa80)
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@@ -89,9 +89,13 @@ If the optional callback is provided, it will be executed after the component is
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> Note:
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>
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> `React.render()` replaces the contents of the container node you
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> pass in. In the future, it may be possible to insert a component to an
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> existing DOM node without overwriting the existing children.
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> `React.render()` controls the contents of the container node you pass in. Any existing DOM elements
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> inside are replaced when first called. Later calls use React’s DOM diffing algorithm for efficient
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> updates.
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>
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> `React.render()` does not modify the container node (only modifies the children of the container). In
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> the future, it may be possible to insert a component to an existing DOM node without overwriting
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> the existing children.
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### React.unmountComponentAtNode
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