Sandbox::https://github.com/web-platform-tests/wpt/blob/master/css/css-values/urls/empty.html

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<!doctype html>

<title>Empty URLs behaviour</title>

<style>

#inline-unquoted {

background-image: url();

cursor: url(), pointer;

}

#inline-quoted {

background-image: url("");

cursor: url(""), pointer;

}

</style>

const ids = [

"inline-unquoted",

"inline-quoted",

"external-unquoted",

"external-quoted"

];

for (let id of ids) {

test(function() {

const el = document.getElementById(id);

const style = window.getComputedStyle(el);

assert_equals(style["background-image"], 'url("")');

assert_equals(style["cursor"], 'url(""), pointer');

}, "empty URL: " + id);

}

</script>