Firefox and Opera are the only browsers capable of loading scripts in parallel while preserving execution order. In all other browsers, scripts must be loaded sequentially.
//只有Firefox和opera支持并行加載腳本，并保持執(zhí)行順序。其他游覽器必須按順序進行加載。
All browsers respect CSS specificity based on the order of the link elements in the DOM, regardless of the order in which the stylesheets are actually downloaded.
//所有游覽器根據(jù)link在樣式表的順序進行渲染，而非根據(jù)最終下載時間。
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