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link在樣式表的順序進行渲染，而非根據最終下載時間。
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