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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Containment Test: 'contain: style' and counter (with 'display: contents')</title>
<link rel="help" href="https://www.w3.org/TR/css-contain-1/#containment-style">
<link rel=help href="https://github.com/w3c/csswg-drafts/issues/7392">
<link rel="match" href="reference/contain-style-counters-001-ref.html">
<meta content="This test checks that when an element has 'contain: style', then counters which may be affecting its subtree are reset to 0 for such scope. In this test, the div#test does not generate a principal box because of 'display: contents'. Despite that particular condition, 'contain: style' will have an effect on div#test." name="assert">
<style>
div#create-counter
{
counter-reset: counter-of-span 9;
}
/*
This creates a new counter identified as "counter-of-span"
and initially sets such counter to 9 (an entirely
arbitrary number).
*/
div#test
{
contain: style;
display: contents;
font-size: 3em;
}
/*
Other types of containment (size, layout, paint) have no
effect on box that do not generate a principal box which
is the case here with div#test because of 'display: contents'.
But in this test, 'contain: style' will apply and will
have a rendering effect on the counter.
*/
div#test span
{
counter-increment: counter-of-span 5;
}
/*
This increments the counter identified as "counter-of-span"
of the step value of 5 (an entirely arbitrary number) each
and every time there is a <span> descendant within the subtree
of div#test
*/
div#test span::after
{
content: counter(counter-of-span);
}
/*
Now, the generated content after the span is set to the
current value of the counter identified as "counter-of-span"
*/
</style>
<p>Test passes if there is the digit 5.
<div id="create-counter"></div>
<div id="test"><span></span></div>
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