static getLengthValueInfo_(lengthValue) {
    const matches = new RegExp(/(\d*\.?\d+)([a-z]+|%+)/).exec(lengthValue);

    if (!matches) {
      return null;
    }

    return {
      value: Number(matches[1]),
      unit: matches[2],
    };
  }
Returns info about provided lengthValue
@example 100px => { value: 100, unit: 'px' }
@param {?string} lengthValue

@return {?{ value: number, unit: string }}
@private