chromium/ash/webui/common/resources/cr_elements/cr_radio_group/cr_radio_group.html

<style>
  :host {
    display: inline-block;
  }

  :host ::slotted(*) {
    padding: var(--cr-radio-group-item-padding, 12px);
  }

  :host([disabled]) {
    cursor: initial;
    pointer-events: none;
    user-select: none;
  }

  :host([disabled]) ::slotted(*) {
    opacity: var(--cr-disabled-opacity);
  }
</style>
<slot></slot>