Specific CSS selector to highlight incomplete stuff

[honyk]

I'd like to tweak the default Author css file to highlight images without the ALT attribute and also those with the ALT, but containing a comment inside.

Correct:

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<inlinemediaobject>
    <imageobject>
        <imagedata fileref="icon.svg"/>
    </imageobject>
    <alt>Print</alt>
</inlinemediaobject>

Incorrect:

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<inlinemediaobject>
    <imageobject>
        <imagedata fileref="icon.svg"/>
    </imageobject>
</inlinemediaobject>

Incorrect:

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<inlinemediaobject>
    <imageobject>
        <imagedata fileref="icon.svg"/>
    </imageobject>
    <alt><!-- FIXME --></alt>
</inlinemediaobject>

So I have the rule which highlights every image:

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inlinemediaobject {
    background-color: coral;
}

And there is a complementary rule which clears highlighting in specific conditions. I am able to detect the existence of the ALT element, but I can't subtract cases when this element contains a comment (to keep the third example highlighted).

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/* this rule doesn't cover the third case
inlinemediaobject:has(alt) {
    background-color: inherit;
}
*/

/* this rule also doesn't cover third case
inlinemediaobject:has(alt:not(oxy|comment)) {
    background-color: inherit;
}

Is something like this possible in Oxygen CSS?

[chrispitude]

Hi honyk,

Would something like this work? (Sorry for any typos, I didn't test it.)

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inlinemediaobject:not(:has(alt)),
inlinemediaobject:has(alt:has(oxy|comment)) {
    background-color: coral;
}

[honyk]

Thanks for the different approach. It works with a small tweak. In the first line I had to add * char.

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inlinemediaobject:not(*:has(alt)),
inlinemediaobject:has(alt:has(oxy|comment)) {
    background-color: coral;
}

And this helped also in my original approach:

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inlinemediaobject {
   background-color: coral;
}

inlinemediaobject:has(alt:not(*:has(oxy|comment))) {
   background-color: inherit;
}

So I can now even choose one of two ways

Thanks for a hint!