iOS 11 introduces new "safe regions" for webviews, which can throw off component sizing, squish the header into
the status bar, letterbox the app on iPhone X, etc. Fixing this issue will ensure the webview takes up the full
size of the screen. See https://blog.ionicframework.com/ios-11-checklist for more information. To fix, take the
following step(s):
1) Add viewport-fit=cover to the <meta name="viewport"> tag in your index.html file
Ignore this issue with: ionic doctor ignore viewport-fit-not-set
[WARN] viewport-fit=cover not set in index.html