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(jìn)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(jìn)行渲染,而非根據(jù)最終下載時(shí)間。