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+[![Build status](https://travis-ci.org/PolymerElements/iron-fit-behavior.svg?branch=master)](https://travis-ci.org/PolymerElements/iron-fit-behavior)
+
+_[Demo and API docs](https://elements.polymer-project.org/elements/iron-fit-behavior)_
+
+
+## Polymer.IronFitBehavior
+
+`Polymer.IronFitBehavior` fits an element in another element using `max-height` and `max-width`, and
+optionally centers it in the window or another element.
+
+The element will only be sized and/or positioned if it has not already been sized and/or positioned
+by CSS.
+
+| CSS properties | Action |
+| --- | --- |
+| `position` set | Element is not centered horizontally or vertically |
+| `top` or `bottom` set | Element is not vertically centered |
+| `left` or `right` set | Element is not horizontally centered |
+| `max-height` set | Element respects `max-height` |
+| `max-width` set | Element respects `max-width` |
+
+`Polymer.IronFitBehavior` can position an element into another element using
+`verticalAlign` and `horizontalAlign`. This will override the element's css position.
+
+```html
+  <div class="container">
+    <iron-fit-impl vertical-align="top" horizontal-align="auto">
+      Positioned into the container
+    </iron-fit-impl>
+  </div>
+```
+
+Use `noOverlap` to position the element around another element without overlapping it.
+
+```html
+  <div class="container">
+    <iron-fit-impl no-overlap vertical-align="auto" horizontal-align="auto">
+      Positioned around the container
+    </iron-fit-impl>
+  </div>
+```
+
+