| Index: third_party/polymer/v0_8/components/iron-overlay-behavior/README.md
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| +# iron-overlay-behavior
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| +Makes an element an overlay with an optional backdrop.
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| +
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| +`iron-overlay-behavior` displays an element on top of other content. It starts out hidden and is
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| +displayed by calling `open()` or setting the `opened` property to `true`. It may be closed by
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| +calling `close()` or `cancel()`, or by setting the `opened` property to `true`.
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| +
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| +The difference between `close()` and `cancel()` is user intent. `close()` generally implies that
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| +the user acknowledged the content of the overlay. By default, it will cancel whenever the user taps
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| +outside it or presses the escape key. This behavior can be turned off via the `no-cancel-on-esc-key`
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| +and the `no-cancel-on-outside-click` properties.
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