README

[](https://travis-ci.org/PolymerElements/iron-collapse)

_[Demo and API docs](https://elements.polymer-project.org/elements/iron-collapse)_

##<iron-collapse>

`iron-collapse` creates a collapsible block of content. By default, the content will be collapsed. Use `opened` or `toggle()` to show/hide the content.

```html toggle collapse

...

toggle: function() { this.$.collapse.toggle(); } ```

`iron-collapse` adjusts the max-height/max-width of the collapsible element to show/hide the content. So avoid putting padding/margin/border on the collapsible directly, and instead put a div inside and style that.

```html

### Styling

The following custom properties and mixins are available for styling:

| Custom property | Description | Default | | --- | --- | --- | | `--iron-collapse-transition-duration` | Animation transition duration | `300ms` |