the presentation of information in html files is desirably en hanced by the use of one or more separate scripting javascript ™ files , referenced from the html file , which uses information presented as variables in the html file . in this manner , a high degree of formatting flexibility can be achieved , while reducing the likelihood of errors in the html pages , improving ease of site maintenance , and standardising the “ look and feel ” of the site . improvements in the network bandwidth required to browse sites organised in this manner can also be achieved in favourable instances .