I'm experiencing the same thing with jQuery 1.3.1

In 1.2.6 I can select all <a> elements without the onclick attribute via:

jQuery('a[onclick=""]')

In 1.3.1 the same expression throws an error. Removing the pair of double quotes returns nothing.

$("[value=]") works in 1.2.6, 1.3 and 1.3.1 as this test case shows:

http://jquery.nodnod.net/cases/77

But $('[value=""]') seems to have stopped working in 1.3.1, returns nothing.

Using the test case in Safari 3.2.1, the selector finds the field without the value attribute, but the not the one with the empty value.

Dup of #3990 and fixed at [6181].