I saw the quoted text in the original page and stopped reading right there; who on earth wants to use a query library where you have no idea whether what's returned is an array of elements or just an element?
var allMyPageHeaders = HTML.find(".header");
allMyPageHeaders[0].textContent = 'This is my main header';
... and there's only one element on the page with the class ".header", my code is now broken.Unless I'm missing something, and an "HTML'ified node" acts as an array in the single case.