For example, the ":even" filter should ignore elements with display=none because elements with display=none should be treated as if they don't exist. (See text below copy and pasted from w3.org.) When skipping, the index used for filtering should not be incremented.

I've provided a complete example here:

http://jsfiddle.net/3NZ8C/

Here is the quote from w3.org regarding disp:

This value causes an element to not appear in the formatting structure (i.e., in visual media the element generates no boxes and has no effect on layout). Descendant elements do not generate any boxes either; the element and its content are removed from the formatting structure entirely. This behavior cannot be overridden by setting the 'display' property on the descendants.

Please note that a display of 'none' does not create an invisible box; it creates no box at all. CSS includes mechanisms that enable an element to generate boxes in the formatting structure that affect formatting but are not visible themselves. Please consult the section on visibility for details.

The fix might be easy. (Maybe I've overlooked something.) I just use an i_among_displayed variable and skip cases of display===none:

if ( match ) {

var i_among_displayed = 0;

for ( i = 0; (item = curLoop[i]) != null; i++ ) {

if ( item ) {

if ( jQuery.css( item, "display" ) === "none" ) {

continue;

}

found = filter( item, match, i_among_displayed, curLoop );

...

i_among_displayed++;

I just made this change in a fork in github. After I click "Create ticket", I'll submit a pull request referencing this ticket.