[whatwg/dom] Details missing on (lack of) namespace support in Element.match (#458)

The draft of 9 May 2017 says: "Support for namespaces within selectors is not planned and will not be added."

How should selectors behave when they use the pipe notation? Should that result in an error message? Currently browser handle this partially.

```js
document.documentElement.matches("*|html")
true
document.documentElement.matches("|html")
false
document.documentElement.matches("html")
true
```

This follows the rules nicely.
https://www.w3.org/TR/css3-selectors/#typenmsp
https://www.w3.org/TR/selectors4/#typenmsp

(document.documentElement.namespaceURI in current browsers is "http://www.w3.org/1999/xhtml" for HTML5 documents. So not empty, hence the false when testing with "|html").

It would be good if the draft says "Support for namespaces *prefixes* within selectors is not planned and will not be added."

(tested Firefox and Chromium)



-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/dom/issues/458