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

<style include="cr-radio-button-style cr-hidden-style"></style>

<div aria-checked$="[[getAriaChecked_(checked)]]"
    aria-describedby="slotted-content"
    aria-disabled$="[[getAriaDisabled_(disabled)]]"
    aria-labelledby="label"
    class="disc-wrapper"
    id="button"
    role="radio"
    tabindex$="[[buttonTabIndex_]]"
    on-keydown="onInputKeydown_">
  <div class="disc-border"></div>
  <div class="disc"></div>
  <div id="overlay"></div>
</div>

<div id="labelWrapper">
  <span id="label" hidden$="[[!label]]" aria-hidden="true">[[label]]</span>
  <span id="slotted-content">
    <slot></slot>
  </span>
</div>