@polymer/iron-fit-behavior

Demo and API docs

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.

  <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.

  <div class="container">
    <iron-fit-impl no-overlap vertical-align="auto" horizontal-align="auto">
      Positioned around the container
    </iron-fit-impl>
  </div>