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14 lines
845 B
14 lines
845 B
11 years ago
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---
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id: special-non-dom-attributes
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title: Special Non-DOM Attributes
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layout: docs
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permalink: special-non-dom-attributes.html
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prev: dom-differences.html
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---
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Beside [DOM differences](/react/docs/dom-differences.html), React offers some attributes that simply don't exist in DOM.
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- `key`: an optional, unique identifier. When your component shuffles around during `render` passes, it might be destroyed and recreated due to the diff algorithm. Assigning it a key that persists makes sure the component stays. See more [here](/react/docs/multiple-components.html#dynamic-children).
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- `ref`: see [here](/react/docs/more-about-refs.html).
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- `dangerouslySetInnerHTML`: takes an object with the key `__html` and a DOM string as value. This is mainly for cooperating with DOM string manipulation libraries. Refer to the last example on the front page.
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