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The document discusses the messy and buggy state of the DOM across browsers and strategies for writing cross-browser JavaScript code. It notes that nearly every DOM method has bugs or inconsistencies in some browsers. It then covers strategies like feature detection, graceful fallback for missing features, simulating features via workarounds, monitoring for regressions, and having a robust test suite to prevent regressions in one's own code. The overall message is that the DOM is messy and one needs to "know your enemies" by thoroughly testing code in all target browsers.














































































