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Message: [QUOTE="Peter Michaux, post: 4962268"] [snip] The above function will be defined in browsers without ownerDocument or parentNode. NN4 seems to be one example. Wouldn't it be better to write the following? if (typeof getAnElement == 'function') { var html = getAnElement(); var elementDocument = (function() { if (isRealObjectProperty(html, 'ownerDocument')) { return function(el) { return el.ownerDocument; }; } else if (isRealObjectProperty(html, 'parentNode')) { return function(el) { var e; while (e = el.parentNode) { el = e; } return el; }; } })(); } I'm assuming the extra "e" variable is faster than accessing parentNode property twice. [snip] [/QUOTE]