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test/rendering/cases/webgl-tilewms-gutter20/main.js

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+import Map from '../../../../src/ol/Map.js';
+import TileLayer from '../../../../src/ol/layer/WebGLTile.js';
+import TileWMS from '../../../../src/ol/source/TileWMS.js';
+import View from '../../../../src/ol/View.js';
+
+const tileWms = new TileWMS({
+  params: {
+    'LAYERS': 'layer',
+  },
+  gutter: 20,
+  url: '/data/tiles/wms/wms20.png',
+  transition: 0,
+});
+
+new Map({
+  pixelRatio: 1.5,
+  layers: [new TileLayer({source: tileWms})],
+  target: 'map',
+  view: new View({
+    center: [0, 0],
+    zoom: 5,
+  }),
+});
+
+render();