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we (web engine): Experimental web browser project to understand the limits of Claude
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123456789101112131415161718192021222324<!DOCTYPE html><meta charset="utf-8"><title>Node.insertBefore</title><script src="/resources/testharness.js"></script><script src="/resources/testharnessreport.js"></script><div id="log"></div><script>test(function() { var parent = document.createElement("div"); var first = document.createElement("span"); var second = document.createElement("p"); parent.appendChild(second); parent.insertBefore(first, second); assert_true(parent.hasChildNodes());}, "insertBefore inserts node before reference");
test(function() { var parent = document.createElement("div"); var child = document.createElement("span"); var result = parent.insertBefore(child, null); assert_equals(result.tagName, "SPAN");}, "insertBefore with null reference appends");</script>