Where are constructors such as, `new Image()` and `new Option()`, documented?

Not at Mozilla but:

• for image:
  Thanks to Rickard for identifying
  http://www.w3.org/html/wg/drafts/html/CR/embedded-content-0.html#dom-image
  that provides the DOM interface constructor details.
• for option:
  http://www.w3.org/html/wg/drafts/html/CR/forms.html#dom-option
  also gives the DOM interface constructor details.
  (Found using:
  http://www.google.com/search?client=ubuntu&channel=fs&q=constructor+site%3Adev.w3.org%2Fhtml5&ie=utf-8&oe=utf-8)

Given these references, it is moot whether mozilla.org, as asked below, documents the same.

Specifically, where at mozilla.org are constructors like new Image() and new Option() documented in a contemporary context?

Archaic documentation,

• Image() defined at http://devedge-temp.mozilla.org/library/manuals/2000/javascript/1.3/reference/image.html
• Option() defined at http://devedge-temp.mozilla.org/library/manuals/2000/javascript/1.3/reference/option.html

describes the existence