<!DOCTYPE html >
<html >
<head >
<title >CSS Selectors: :is()</title >
<link rel="author" title ="Victoria Su" href="mailto:victoriaytsu@google.com" >
<link rel="help" href="https://drafts.csswg.org/selectors-4/#matches " >
<meta name="assert" content="This tests that the :is() selector is effective when nested" >
<script src="/resources/testharness.js" ></script >
<script src="/resources/testharnessreport.js" ></script >
<style >
/* Testing that highest specificity is chosen for class outside of :is() */
.a+.b+.c>.e+.d {
color: black;
font-size: 10px;
width: 10px;
}
.e:is(.b+.f, .e:is(*, .c>.e, .g, *))+.d {
color: red;
font-size: 20px;
}
.a+.b+.c>.e+.d {
color: yellow;
}
/* Testing specificty of a class within :is() */
.a+.c>.e {
color: black;
}
.e:is(.b+.f, :is(.c>.e, .g)) {
color: red;
}
.c>.e {
color: black;
}
</style >
</head >
<body >
<div class="a" >
</div >
<div class="b" id="b2" >
</div >
<div class="c" id="c2" >
<div class="e" >
</div >
<div class="d" id="d1" >
Yellow
</div >
</div >
<div class="a" >
</div >
<div class="c" id="c2" >
<div class="e" id="e1" >
Red
</div >
</div >
<script >
var red = "rgb(255, 0, 0)" ;
var yellow = "rgb(255, 255, 0)" ;
test(() => {
assert_equals(getComputedStyle(d1).color, yellow);
assert_equals(getComputedStyle(d1).fontSize, "20px" );
assert_equals(getComputedStyle(d1).width, "10px" );
}, "Test nested :is() chooses highest specificity for class outside :is()." );
test(() => {
assert_equals(getComputedStyle(e1).color, red);
}, "Test nested :is() specificity for class within arguments." );
</script >
</body >
</html >
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