pretty sure his browser variable comes from the Ionic docs:
```
import { InAppBrowser } from '@ionic-native/in-app-browser';
constructor(private iab: InAppBrowser) { }
...
const browser = this.iab.create('https://ionicframework.com/');
browser.executeScript(...);
browser.insertCSS(...);
browser.on('loadstop').subscribe(event => {
browser.insertCSS({ code: "body{color: red;" });
});
browser.close();
```
[ Full content available at:
https://github.com/apache/cordova-plugin-inappbrowser/issues/279 ]
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