188413 - missing version in hasFeature produces uncaught exception

Status: RESOLVED INVALID

(Core :: DOM: Core & HTML, defect)

Description

[Henrik Gemal]

<script>
alert(document.implementation.hasFeature("XML"));
</script>

produces:

Error: uncaught exception: [Exception... "Not enough arguments
[nsIDOMDOMImplementation.hasFeature]"  nsresult: "0x80570001
(NS_ERROR_XPC_NOT_ENOUGH_ARGS)"  location: "JS frame :: file:///C:/Temp/dom.html
:: <TOP_LEVEL> :: line 2"  data: no]

http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/level-one-core.html#ID-102161490
says that:
"This is the version number of the feature to test. In Level 1, this is the
string "1.0". If the version is not specified, supporting any version of the
feature causes the method to return true."

So version is optional!

20030108

Comment 1

[Henrik Gemal]

Attachment: testcase

Comment 2

[Boris Zbarsky [:bzbarsky]]

It's "optional" as in you can pass in "null" for it.  It's not optional as in
you can not pass it at all.

Comment 3

[Henrik Gemal]

IE can do this:
alert(document.implementation.hasFeature("XML"));

otherwise -> invalid. you decide.

Comment 4

[Johnny Stenback (:jst)]

The DOM spec says nothing about the *argument* being optional, passing a valid
*value* is optional though, so null, or empty string is ok.

INVALID.