<!doctype html> <title>CSS Variables Test: Exponential blowup doesn't crash</title> <meta charset="UTF-8"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez"> <link rel="author" href="https://mozilla.org" title="Mozilla"> <link rel="help" href="https://drafts.csswg.org/css-variables/"> <script> let css = ` --v0: "Something really really really long"; `; for (let i = 0; i < 31; ++i) css += `--v${i + 1}: var(--v${i}) var(--v${i});`; let s = document.createElement("style"); s.innerHTML = ` :root { ${css}; } :root::before { content: var(--v31); } `; document.head.appendChild(s); </script> PASS if doesn't crash <script> test(function() { getComputedStyle(document.documentElement, "::before").content; assert_true(true, "Didn't crash"); }); </script>