This example uses OpenLayers v10.9.0. The latest is v.
Edit

#### Attributions

attributions 2 openstreetmap 22

#####

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.

##### main.js

    import Map from 'ol/Map.js';
    import View from 'ol/View.js';
    import Attribution from 'ol/control/Attribution.js';
    import {defaults as defaultControls} from 'ol/control/defaults.js';
    import TileLayer from 'ol/layer/Tile.js';
    import OSM from 'ol/source/OSM.js';

    const attribution = new Attribution({
      collapsible: false,
    });
    const 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() {
      const small = map.getSize()[0] < 600;
      attribution.setCollapsible(small);
      attribution.setCollapsed(small);
    }

    map.on('change:size', checkSize);
    checkSize();

##### index.html

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8">
        <title>Attributions</title>
        <link rel="stylesheet" href="node_modules/ol/ol.css">
        <style>
          .map {
            width: 100%;
            height: 400px;
          }
        </style>
      </head>
      <body>
        <div id="map" class="map"></div>

        <script type="module" src="main.js"></script>
      </body>
    </html>

##### package.json

    {
      "name": "attributions",
      "dependencies": {
        "ol": "10.9.0"
      },
      "devDependencies": {
        "vite": "^3.2.3"
      },
      "scripts": {
        "start": "vite",
        "build": "vite build"
      }
    }