function link(overrides) {
    if (overrides.href && !overrides.hrefRaw) overrides.hrefRaw = overrides.href;
    return {
      rel: '',
      href: null,
      hrefRaw: '',
      hreflang: '',
      source: 'head',
      ...overrides,
    };
  }
@param {Partial<LH.Artifacts.LinkElement>} overrides
@return {LH.Artifacts.LinkElement}