function parseOptions(options) {
  return {
    NORMAL: (options && options.html && options.html.normal) || 'always',
    VOID: (options && options.html && options.html.void) || 'never',
    COMPONENT: (options && options.html && options.html.component) || 'always',
    SVG: (options && options.svg) || 'always',
    MATH: (options && options.math) || 'always',
    UNKNOWN: null
  }
}
Normalize the given options.
@param {any} options The raw options object.
@returns {Options} Normalized options.