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function eachDisplayContentsElementIn(document, window, callbackDo, callbackUndo) {
var elements = [];
document.body.offsetHeight;
// NOTE: Doing qsa('*') and getComputedStyle is just for the
// test's sake, since it's easier to mess it up when
// getComputedStyle is involved.
var all = document.querySelectorAll('*');
for (var i = 0; i < all.length; ++i) {
if (window.getComputedStyle(all[i]).display === "contents") {
callbackDo(all[i]);
elements.push(all[i]);
}
}
document.body.offsetHeight;
for (var i = 0; i < elements.length; ++i)
callbackUndo(elements[i]);
document.body.offsetHeight;
}
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