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at-property-shadow.html
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<!DOCTYPE html>
<linkrel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1/#shadow-dom">
<scriptsrc="/resources/testharness.js"></script>
<scriptsrc="/resources/testharnessreport.js"></script>
<scriptsrc="./resources/utils.js"></script>
<style>
@property --x {
syntax:"<length>";
inherits: false;
initial-value:0px;
}
#outside {
--x:calc(1px+1px);
--y:calc(1px+1px);
}
</style>
<templateid=template>
<style>
/* This rule should be globally registered */
@property --y {
syntax:"<length>";
inherits: false;
initial-value:0px;
}
#inside {
--x:calc(1px+1px);
--y:calc(1px+1px);
}
</style>
<divid=inside></div>
</template>
<divid=host></div>
<divid=outside></div>
<script>
test(()=>{
letroot=host.attachShadow({mode: 'open'});
root.append(template.content.cloneNode(true));
letinside=root.querySelector('#inside');
assert_equals(getComputedStyle(outside).getPropertyValue('--x'),'2px');
assert_equals(getComputedStyle(outside).getPropertyValue('--y'),'2px');
assert_equals(getComputedStyle(inside).getPropertyValue('--x'),'2px');
assert_equals(getComputedStyle(inside).getPropertyValue('--y'),'2px');
},'@property rules in shadow trees should be globally registered');
</script>