function findSizeDeclaration(rule, property) {
  if (!rule || !rule.cssProperties) return;

  const definedProp = rule.cssProperties.find(({name}) => name === property);
  if (!definedProp) return;

  return definedProp.value;
}
@param {Partial<Pick<LH.Crdp.CSS.CSSStyle, 'cssProperties'>>|undefined} rule
@param {string} property
@return {string | undefined}