Select last element without a class [duplicate] - css

Question

This question already has answers here:
How do I select the "last child" with a specific class name in CSS? [duplicate]
(6 answers)
Can I combine :nth-child() or :nth-of-type() with an arbitrary selector?
(8 answers)
Closed 3 years ago.
I'm dynamically adding and removing classes to and from elements on specific JS events. What I would like to do is select the last child element that has none these classes with CSS.
Example #1
<container-element>
<h2></h2>
<div class='some-class'></div>
<div></div>
<div></div> <!-- select this div -->
</container-element>
Example #2
<container-element>
<h2></h2>
<div></div>
<div></div> <!-- select this div -->
<div class='some-class'></div>
</container-element>
Is it possible to write a CSS selector to do this?
Something like container-element > div:not(.select):last-of-type?

Answer 1

Per this answer, the solution would technically be container-element > div:nth-last-child(1 of :not(.select)).
However, this of S clause in :nth-last-child is still not supported by any browser other than Safari.

Answer 2

You're saying: select the last sibling that doesn't contain a class attribute.
I don't believe it's possible with currently available CSS.
You're asking a waterfall (the cascade) to run upward. The browser needs to check the last element, then check the ones that came before it. This is not how CSS works.
div:not(.some-class):last-of-type won't work because the browser doesn't move up automatically to the next sibling.

Answer 3

Of course I can do this with JS, but preferred a pure CSS solution. Supposedly a pure CSS solution is not possible, so the next best thing is an CSS solution with a little extra HTML.
The trick was to add a class, not-selected, to all of the elements, then remove this class from the element that you want to target with the CSS selector.
And the CSS selector would be div:not([class*='not-selected']).
div:not([class*='not-selected']) {
background: red;
}
<button type='button'>
<h2>title</h2>
<div class='not-selected'>option one</div>
<div>option two</div>
<div class='not-selected'>option three</div>
</button>