ArsenInvoker, кликните по странице потом нажмите Esc
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document.onkeydown = function(a) {
27 == a.keyCode && alert("\u0427\u0438\u0442\u0430\u0439\u0442\u0435 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u044e")
};
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. <b>Idemne, quod iucunde?</b> <mark>Non semper, inquam;</mark> Nihilo beatiorem esse Metellum quam Regulum. Ita similis erit ei finis boni, atque antea fuerat, neque idem tamen; </p>
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