[1] HTMLElement

	Form (JavaScript 1.0)
acceptCharset	HTMLFormElement2 (Trident)
action	Form (JavaScript 1.0)
elements	Form (JavaScript 1.0)
encoding	Form (JavaScript 1.0)
handleEvent	Form (JavaScript 1.2)
item	HTMLFormElement (Trident)
length	Form (JavaScript 1.0)
method	Form (JavaScript 1.0)
name	Form (JavaScript 1.0)
namedItem	HTMLFormElement3 (Trident)
onreset	Form (JavaScript 1.0)
onsubmit	Form (JavaScript 1.0)
reset	Form (JavaScript 1.1)
submit	Form (JavaScript 1.0)
tags	HTMLFormElement (Trident)
target	Form (JavaScript 1.0)
urns	HTMLFormElement2 (Trident)
制御子名	Form (JavaScript 1.0)

[2] Change HTMLFormElement.length to be of type unsigned long · whatwg/html@8558f93 (2016-01-14 15:22:13 +09:00 版) https://github.com/whatwg/html/commit/8558f93f86a8a910fa23d961e271e7333e16170e