react-native-devtools-frontend/test/e2e/resources/elements/css-layers.html

<!DOCTYPE html>
<style>
  div {
    width: 0px;
    height: 0px;
  }

  @layer base {
    .rule1 {
      width: 10px;
    }
  }

  @layer overrule {
    .rule1 {
      width: 15px;
    }
    @layer {
      .rule1 {
        width: 16px;
      }
    }
  }

  @layer important {
    .rule1 {
      width: 20px !important;
    }
  }

  @layer {
    .rule1 {
      width: 25px !important;
    }
  }
</style>
<div class="rule1"></div>