Blitz - WPT: property-accessors.html

wpt / css / cssom / property-accessors.html
Enable JavaScript in test iframe
<!doctype html>
<html>
<meta charset="utf-8">
<title>Accessing properties via CSSStyleDeclaration</title>
<link rel="help" href="https://drafts.csswg.org/cssom/#the-cssstyledeclaration-interface">
<!-- this is really a crash test, but let's claim it's a testharness test -->
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@font-face {}
</style>
<div id="testElement"></div>
<script>
// Goal here is to test a cross-section of prefixed, properties, and descriptors.
const properties = [
  "-apple-color-filter", "-apple-pay-button-style", "-epub-writing-mode",
  "-webkit-flex", "gap", "grid-gap", "overscroll-behavior",
  "src", "unicode-range",
];

const el = document.getElementById("testElement");
const decls = [window.getComputedStyle(el), el.style, document.styleSheets[0].cssRules[0].style];

for (const prop of properties) {
  test(() => {
    for (const decl of decls) {
      let _;

      _ = decl[prop];
      try {
        decl[prop] = "nonsense";
      } catch {
        assert_equals(decl, decls[0]);
      }

      _ = decl.cssText;
      try {
        decl.cssText = `${prop}: nonsense`;
      } catch {
        assert_equals(decl, decls[0]);
      }

      _ = decl.getPropertyValue(prop);
      _ = decl.getPropertyPriority(prop);

      if ("getPropertyCSSValue" in decl) {
        _ = decl.getPropertyCSSValue(prop);
      }

      try {
        decl.setProperty(prop, "nonsense", "");
      } catch {
        assert_equals(decl, decls[0]);
      }

      try {
        decl.removeProperty(prop);
      } catch {
        assert_equals(decl, decls[0]);
      }
    }
  }, prop);
}
</script>