How to add a flag icon in ion-select-option

Actually i think will go with the sprite flags. Should i download the repository and put it in my assets folder? or what? I totally forgot how to use those.

First copy the set you want to you to your local html project

Next edit the CSS filename and make sure the image url is correct for your project:

.flag.flag-24 {
  // ...
  background-image: url('sprite-flags-24x24.png'); 
  // ...
}
Next include the appropriate CSS file in the head of your HTML. E.g. if you want to use 24x24 and the filename is sprite-flags-24x24.css in your project

<link
  rel="stylesheet"
  type="text/css"
  href="sprite-flags-24x24.css"
/>