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Demo and API docs

<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.

<button on-click="toggle">toggle collapse</button>

<iron-collapse id="collapse">
  <div>Content goes here...</div>
</iron-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.

<style>
  .collapse-content {
    padding: 15px;
    border: 1px solid #dedede;
  }
</style>

<iron-collapse>
  <div class="collapse-content">
    <div>Content goes here...</div>
  </div>
</iron-collapse>

Styling

The following custom properties and mixins are available for styling:

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

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  • HTML 100.0%