background-shorthand-serialization.html

<!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>
chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/parsing/background-shorthand-serialization.html
