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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.
//Only Firefox and opera support parallel loading scripts and maintain execution order. Other browsers must be loaded sequentially.
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.
//All browsers respect CSS specificity based on the link in the style Rendering is done in table order, not based on final download time.