<!doctype html>
<meta charset="utf-8">
<title>CSSStyleDeclaration index getter v. attributes</title>
<link rel="help" href="https://drafts.csswg.org/cssom/#the-cssstyledeclaration-interface">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/2529">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="testElement"></div>
<script>

/* per spec, the indexed getter gives all supported longhand properties, whereas
   attributes are created for all supported properties; this implies the indexed
   getter gives a subset of the attributes */

const decl = window.getComputedStyle(document.getElementById("testElement"));
const declItems = Array.from(decl).sort();

const shorthands = ['border-top', 'border-right', 'border-bottom', 'border-left', 'border', 'font'];
const non_shorthands = ['margin-top', 'font-size', 'max-width', 'width'];

for (const prop of shorthands) {
  test(() => {
    assert_true(prop in decl, "getComputedStyle attribute");
    assert_false(declItems.includes(prop), "getComputedStyle indexed getter");
  }, prop);
}

for (const prop of non_shorthands) {
  test(() => {
    assert_true(prop in decl, "getComputedStyle attribute");
    assert_true(declItems.includes(prop), "getComputedStyle indexed getter");
  }, prop);
}
</script>
