Example of a attributions visibily change on map resize, to collapse them on small maps.

When the map gets too small because of a resize, the attribution will be collapsed. This is because the collapsible option is set to true if the width of the map gets smaller than 600 pixels.

<!DOCTYPE html>
    <link rel="stylesheet" href="" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src=",Element.prototype.classList,URL"></script>

    <div id="map" class="map"></div>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import {defaults as defaultControls, Attribution} from 'ol/control.js';
      import TileLayer from 'ol/layer/Tile.js';
      import OSM from 'ol/source/OSM.js';

      var attribution = new Attribution({
        collapsible: false
      var map = new Map({
        layers: [
          new TileLayer({
            source: new OSM()
        controls: defaultControls({attribution: false}).extend([attribution]),
        target: 'map',
        view: new View({
          center: [0, 0],
          zoom: 2

      function checkSize() {
        var small = map.getSize()[0] < 600;

      window.addEventListener('resize', checkSize);