Tilde (~) attribute selector not working

[ghost]

html5qp($html, '[attr~="anything"]');
bug: Selects elements that have the specified attribute containing any value.
expected: Selects elements that have the specified attribute with a value containing a given word, delimited by spaces.

example:
qp($html, '[rel~="icon"]'); should return elements containing something like rel="icon" or rel="value icon" etc...
instead it returns the first element with a rel attribute, which happens to be a stylesheet.