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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Background Shorthand Serialization Test: background shorthand should only serialize non-initial values</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#background">
<meta name="assert" content="background shorthand should only serialize non-initial values">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
const element = document.createElement('div');
test((t) => {
element.style = 'background: yellow;';
assert_equals(element.style.background , 'yellow');
}, "single value");
test((t) => {
element.style = 'background: no-repeat url(/favicon.ico);';
assert_equals(element.style.background , 'url("/favicon.ico") no-repeat');
}, "multiple values");
test((t) => {
element.style = 'background: url(/favicon.ico) no-repeat, url(/favicon.ico) no-repeat;';
assert_equals(element.style.background , 'url("/favicon.ico") no-repeat, url("/favicon.ico") no-repeat');
}, "multiple backgrounds");
test((t) => {
element.style = 'background: url("/favicon.ico") 0% 0% / 10rem;';
assert_equals(element.style.background , 'url("/favicon.ico") 0% 0% / 10rem');
}, "background-size with non-initial background-position");
test((t) => {
element.style = `background: url(/favicon.ico) top left no-repeat,
url(/favicon.ico) center / 100% 100% no-repeat,
url(/favicon.ico) white;`;
assert_equals(element.style.background , 'url("/favicon.ico") left top no-repeat, url("/favicon.ico") center center / 100% 100% no-repeat, white url("/favicon.ico")');
}, "multiple backgrounds with varying values");
test((t) => {
element.style = `background: padding-box border-box;`;
assert_equals(element.style.background , 'none');
}, "all initial values");
</script>
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