@polymer/polymer/test/unit/sub/style-import.html

The Polymer library makes it easy to create your own web components. Give your element some markup and properties, and then use it on a site. Polymer provides features like dynamic templates and data binding to reduce the amount of boilerplate you need to

<dom-module id="style-import">
  <template>
    <style>
      .foo {
        height: 2px;
        border: 1px solid orange;
        background: url(google.png);
      }
    </style>
  </template>
</dom-module>

<dom-module id="style-import2">
  <template>
    <style>
      .foo {
        width: 4px;
      }
    </style>
  </template>
</dom-module>